Subjects

Subjects

More

Search

AI Knowunity

Subjects

/

Arithmetic

/

Negative Numbers

/

Understanding Multiplying and Dividing Fractions

Easy Ways to Divide Rational Numbers, Fractions, and Decimals

View

Easy Ways to Divide Rational Numbers, Fractions, and Decimals
user profile picture

parker!

@gogamerp_eflc

·

8 Followers

Follow

Learning to work with numbers requires understanding key mathematical operations and rules.

How to divide rational numbers and fractions involves following specific steps to get accurate results. When dividing fractions, you first need to keep the first fraction the same, change the division sign to multiplication, and then flip (find the reciprocal of) the second fraction. For example, when dividing 3/4 ÷ 2/5, you would rewrite it as 3/4 × 5/2. Then multiply the numerators and denominators separately: (3 × 5)/(4 × 2) = 15/8. This method works because multiplying by the reciprocal is the same as dividing.

When working with Steps for dividing decimals in math, you first need to move the decimal point in the divisor (the number you're dividing by) to make it a whole number. Then move the decimal point in the dividend (the number being divided) the same number of places. After setting up the division problem with the new numbers, divide as you would with whole numbers. The decimal point in your answer should line up with the decimal point in the dividend. Understanding the quotient of integers with different signs is also crucial - when dividing numbers with different signs (positive and negative), your answer will be negative. For instance, when dividing a positive number by a negative number or vice versa, the result is always negative. However, when dividing two negative numbers, the result is positive because negative divided by negative equals positive.

These mathematical concepts build upon each other and are essential for more advanced mathematics. Understanding these fundamental rules helps students solve more complex problems and develop stronger problem-solving skills. Regular practice with different types of division problems, including those with mixed numbers, improper fractions, and various decimal places, helps reinforce these concepts and builds confidence in mathematical abilities.

10/31/2023

295

Dividing Rational Numbers (Fractions and Mixed Numbers) EXAMPLE #2 NOTES EXAMPLE #1 -99 10 299. STQ NO 18 EXAMPLE #3 9-12/0+-2-²/20 (+) 23 3

View

Understanding Division of Rational Numbers and Integers

When working with How to divide rational numbers and fractions, it's essential to follow a systematic approach. First, convert any mixed numbers or whole numbers into improper fractions. This conversion ensures consistency in the calculation process and makes the division operation more straightforward.

Definition: Rational numbers are numbers that can be expressed as a ratio of two integers, where the denominator is not zero.

When dividing fractions, change the division operation to multiplication and use the reciprocal of the second fraction. This method, known as "Keep, Change, Flip," is fundamental to fraction division. After multiplying, simplify the result and ensure the correct sign is applied based on the signs of the original numbers.

For Understanding the quotient of integers with different signs, remember that when dividing numbers with different signs, the result is negative. Conversely, when dividing numbers with the same sign, the result is positive. This principle is crucial for correctly determining the sign of your final answer.

Dividing Rational Numbers (Fractions and Mixed Numbers) EXAMPLE #2 NOTES EXAMPLE #1 -99 10 299. STQ NO 18 EXAMPLE #3 9-12/0+-2-²/20 (+) 23 3

View

Mastering Decimal Division in Mathematics

When working with Steps for dividing decimals in math, the process requires careful attention to decimal placement. The key is to transform the problem into whole number division by moving decimal points appropriately.

Highlight: Always move the decimal point in both the dividend and divisor the same number of places to the right until the divisor becomes a whole number.

In decimal division, place the decimal point straight up in the quotient. The result must be either a terminating decimal (one that ends) or a repeating decimal (one with a pattern). Understanding this helps verify if your answer is reasonable.

When working with negative decimals, apply the same rules for signs as with regular integers: different signs yield a negative result, while same signs give a positive result. This consistency in mathematical rules helps maintain accuracy in calculations.

Dividing Rational Numbers (Fractions and Mixed Numbers) EXAMPLE #2 NOTES EXAMPLE #1 -99 10 299. STQ NO 18 EXAMPLE #3 9-12/0+-2-²/20 (+) 23 3

View

Integer Division Fundamentals

Integer division follows specific rules regarding signs and operations. The word "per" in mathematical context often indicates division, making it important to recognize this terminology in word problems.

Example: If you lose 78 points in 13 minutes, to find the points per minute, divide -78 by 13, resulting in -6 points per minute.

Remember that zero divided by any number equals zero, but division by zero is undefined. This is a fundamental rule in mathematics that prevents mathematical contradictions. When writing division problems, they can be expressed using a fraction bar, which helps visualize the relationship between the dividend and divisor.

Dividing Rational Numbers (Fractions and Mixed Numbers) EXAMPLE #2 NOTES EXAMPLE #1 -99 10 299. STQ NO 18 EXAMPLE #3 9-12/0+-2-²/20 (+) 23 3

View

Properties of Mathematical Operations

The commutative property of addition states that the order of addends doesn't affect the sum. This applies to both arithmetic and algebraic expressions.

Vocabulary: Arithmetic expressions involve numbers and operations, while algebraic expressions include variables.

For example, 4 + 6 = 6 + 4, and x + y = y + x demonstrate this property in both arithmetic and algebraic contexts. Understanding these properties helps in simplifying mathematical expressions and solving complex problems more efficiently.

This property is particularly useful when working with multiple terms and variables, as it provides flexibility in how we arrange terms while maintaining mathematical accuracy.

Dividing Rational Numbers (Fractions and Mixed Numbers) EXAMPLE #2 NOTES EXAMPLE #1 -99 10 299. STQ NO 18 EXAMPLE #3 9-12/0+-2-²/20 (+) 23 3

View

Understanding Properties of Mathematical Operations

The associative property of addition states that when adding three or more numbers, the grouping of numbers doesn't affect the final sum. For example, (1 + 2) + 4 gives the same result as 1 + (2 + 4). This fundamental principle helps simplify complex calculations and proves especially useful in algebra.

Definition: The associative property states that (a + b) + c = a + (b + c) for addition, and (a × b) × c = a × (b × c) for multiplication.

When working with rational numbers, the additive inverse property becomes crucial. Every number has an opposite that, when added together, equals zero. This property is essential for solving equations and understanding negative numbers. For instance, 50 + (-50) = 0 demonstrates this principle clearly.

The multiplicative identity property states that any number multiplied by 1 maintains its original value. This seemingly simple concept plays a vital role in fraction operations and algebraic manipulations. For example, -5,486 × 1 = -5,486 shows how this property preserves numerical values.

Dividing Rational Numbers (Fractions and Mixed Numbers) EXAMPLE #2 NOTES EXAMPLE #1 -99 10 299. STQ NO 18 EXAMPLE #3 9-12/0+-2-²/20 (+) 23 3

View

How to divide rational numbers and fractions

Understanding how to work with rational numbers requires mastery of several key properties. The commutative property of multiplication states that factors can be multiplied in any order without changing the product. For example, 4 × 5 = 5 × 4 = 20.

Example: When multiplying fractions like 2/3 × 3/4, the order doesn't matter: 2/3 × 3/4 = 3/4 × 2/3 = 6/12 = 1/2

The distributive property allows us to "distribute" a factor to terms within parentheses. This property is particularly useful when working with algebraic expressions and mixed numbers. For instance, 5(2 + 3) can be rewritten as 5(2) + 5(3).

When multiplying rational numbers, it's essential to follow specific steps: first convert mixed numbers to improper fractions, then multiply numerators and denominators separately, and finally simplify the result. This systematic approach ensures accurate calculations.

Dividing Rational Numbers (Fractions and Mixed Numbers) EXAMPLE #2 NOTES EXAMPLE #1 -99 10 299. STQ NO 18 EXAMPLE #3 9-12/0+-2-²/20 (+) 23 3

View

Steps for dividing decimals in math

The multiplicative inverse property states that any number multiplied by its reciprocal equals 1. This property forms the foundation for division of fractions, as division by a number is equivalent to multiplication by its reciprocal.

Highlight: When dividing fractions, multiply by the reciprocal of the divisor. For example, to divide by 2/3, multiply by 3/2.

Working with mixed numbers requires careful attention to sign rules. When multiplying or dividing rational numbers with different signs, the result will be negative. For example, -2 2/3 × (-3 2/1) requires converting to improper fractions first, then applying sign rules.

The process of dividing decimals involves similar principles but requires additional attention to decimal point placement. Converting decimals to fractions often simplifies calculations and helps avoid common errors.

Dividing Rational Numbers (Fractions and Mixed Numbers) EXAMPLE #2 NOTES EXAMPLE #1 -99 10 299. STQ NO 18 EXAMPLE #3 9-12/0+-2-²/20 (+) 23 3

View

Understanding the quotient of integers with different signs

When working with integers of different signs, specific rules govern the resulting sign of their quotient. A fundamental principle states that when dividing two numbers with different signs, the result is negative. When dividing two numbers with the same sign, the result is positive.

Vocabulary: Quotient - The result obtained when dividing one number by another. Integer - Any whole number, positive or negative, including zero.

These sign rules extend to more complex operations involving fractions and mixed numbers. For example, when solving -10 ÷ (2/3), first convert the division to multiplication by the reciprocal, then apply the sign rules: -10 × (3/2) = -15.

Understanding these properties and rules allows students to confidently work with rational numbers, whether they appear as fractions, decimals, or mixed numbers. Regular practice with various problem types helps reinforce these concepts and develop mathematical fluency.

Dividing Rational Numbers (Fractions and Mixed Numbers) EXAMPLE #2 NOTES EXAMPLE #1 -99 10 299. STQ NO 18 EXAMPLE #3 9-12/0+-2-²/20 (+) 23 3

View

Understanding How to Multiply Rational Numbers and Decimals

When working with How to divide rational numbers and fractions, it's essential to understand the systematic approach to multiplication. The process involves careful attention to decimal places and sign rules, making it accessible for students at all levels.

The first step in multiplying decimal numbers involves arranging the factors and carefully counting decimal places. For each number being multiplied, count the total number of digits after the decimal point. This count becomes crucial for placing the decimal point correctly in your final answer. For instance, when multiplying -6.5411 by -0.0023, you would first note that the first number has four decimal places, while the second has four decimal places.

Definition: Rational numbers are any numbers that can be expressed as a fraction p/q where p and q are integers and q ≠ 0. This includes decimals, whole numbers, and fractions.

Understanding sign rules is crucial when multiplying rational numbers. When multiplying two negative numbers, the result is positive. When multiplying a positive and negative number, the result is negative. This follows the fundamental rule that negative times negative equals positive, while negative times positive equals negative.

Example: When multiplying 5.8 × (-0.24):

  1. Count decimal places (5.8 has 1, -0.24 has 2, total = 3)
  2. Multiply absolute values: 58 × 24 = 1392
  3. Apply sign rules (positive × negative = negative)
  4. Place decimal point: -1.392
Dividing Rational Numbers (Fractions and Mixed Numbers) EXAMPLE #2 NOTES EXAMPLE #1 -99 10 299. STQ NO 18 EXAMPLE #3 9-12/0+-2-²/20 (+) 23 3

View

Working with Powers of Ten and Special Cases in Decimal Multiplication

A special consideration in decimal multiplication involves working with powers of ten, which follows distinct patterns that simplify calculations. When multiplying a decimal by a power of ten (10, 100, 1000, etc.), the process becomes more straightforward than standard decimal multiplication.

The key principle is that for each zero in the power of ten, the decimal point moves that many places to the right in the multiplicand. For example, when multiplying by 100 (which has two zeros), move the decimal point two places to the right. This understanding helps in quickly solving problems involving powers of ten without performing traditional multiplication algorithms.

Highlight: When multiplying by powers of ten, simply move the decimal point right by the number of zeros in the multiplier. For example, 0.642 × 10,000 = 6,420.

Working with mixed numbers and complex decimals requires careful attention to place value and sign rules. Breaking down complex calculations into smaller steps helps maintain accuracy and understanding. For instance, when multiplying -23.579 by -100, first determine the sign (positive since both numbers are negative), then move the decimal point two places right due to the two zeros in 100, resulting in 2,357.9.

Vocabulary: Place value refers to the position of a digit in a number and determines its value in the overall number. Each position represents a power of ten.

Can't find what you're looking for? Explore other subjects.

Knowunity is the # 1 ranked education app in five European countries

Knowunity was a featured story by Apple and has consistently topped the app store charts within the education category in Germany, Italy, Poland, Switzerland and United Kingdom. Join Knowunity today and help millions of students around the world.

Ranked #1 Education App

Download in

Google Play

Download in

App Store

Knowunity is the # 1 ranked education app in five European countries

4.9+

Average App Rating

15 M

Students use Knowunity

#1

In Education App Charts in 12 Countries

950 K+

Students uploaded study notes

Still not sure? Look at what your fellow peers are saying...

iOS User

I love this app so much [...] I recommend Knowunity to everyone!!! I went from a C to an A with it :D

Stefan S, iOS User

The application is very simple and well designed. So far I have found what I was looking for :D

SuSSan, iOS User

Love this App ❤️, I use it basically all the time whenever I'm studying

Subjects

/

Arithmetic

/

Negative Numbers

/

Understanding Multiplying and Dividing Fractions

Easy Ways to Divide Rational Numbers, Fractions, and Decimals

user profile picture

parker!

@gogamerp_eflc

·

8 Followers

Follow

Learning to work with numbers requires understanding key mathematical operations and rules.

How to divide rational numbers and fractions involves following specific steps to get accurate results. When dividing fractions, you first need to keep the first fraction the same, change the division sign to multiplication, and then flip (find the reciprocal of) the second fraction. For example, when dividing 3/4 ÷ 2/5, you would rewrite it as 3/4 × 5/2. Then multiply the numerators and denominators separately: (3 × 5)/(4 × 2) = 15/8. This method works because multiplying by the reciprocal is the same as dividing.

When working with Steps for dividing decimals in math, you first need to move the decimal point in the divisor (the number you're dividing by) to make it a whole number. Then move the decimal point in the dividend (the number being divided) the same number of places. After setting up the division problem with the new numbers, divide as you would with whole numbers. The decimal point in your answer should line up with the decimal point in the dividend. Understanding the quotient of integers with different signs is also crucial - when dividing numbers with different signs (positive and negative), your answer will be negative. For instance, when dividing a positive number by a negative number or vice versa, the result is always negative. However, when dividing two negative numbers, the result is positive because negative divided by negative equals positive.

These mathematical concepts build upon each other and are essential for more advanced mathematics. Understanding these fundamental rules helps students solve more complex problems and develop stronger problem-solving skills. Regular practice with different types of division problems, including those with mixed numbers, improper fractions, and various decimal places, helps reinforce these concepts and builds confidence in mathematical abilities.

10/31/2023

295

 

7th

 

Arithmetic

46

Dividing Rational Numbers (Fractions and Mixed Numbers) EXAMPLE #2 NOTES EXAMPLE #1 -99 10 299. STQ NO 18 EXAMPLE #3 9-12/0+-2-²/20 (+) 23 3

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Understanding Division of Rational Numbers and Integers

When working with How to divide rational numbers and fractions, it's essential to follow a systematic approach. First, convert any mixed numbers or whole numbers into improper fractions. This conversion ensures consistency in the calculation process and makes the division operation more straightforward.

Definition: Rational numbers are numbers that can be expressed as a ratio of two integers, where the denominator is not zero.

When dividing fractions, change the division operation to multiplication and use the reciprocal of the second fraction. This method, known as "Keep, Change, Flip," is fundamental to fraction division. After multiplying, simplify the result and ensure the correct sign is applied based on the signs of the original numbers.

For Understanding the quotient of integers with different signs, remember that when dividing numbers with different signs, the result is negative. Conversely, when dividing numbers with the same sign, the result is positive. This principle is crucial for correctly determining the sign of your final answer.

Sign up for free!

Learn faster and better with thousand of available study notes

App

By signing up you accept Terms of Service and Privacy Policy

Dividing Rational Numbers (Fractions and Mixed Numbers) EXAMPLE #2 NOTES EXAMPLE #1 -99 10 299. STQ NO 18 EXAMPLE #3 9-12/0+-2-²/20 (+) 23 3

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Mastering Decimal Division in Mathematics

When working with Steps for dividing decimals in math, the process requires careful attention to decimal placement. The key is to transform the problem into whole number division by moving decimal points appropriately.

Highlight: Always move the decimal point in both the dividend and divisor the same number of places to the right until the divisor becomes a whole number.

In decimal division, place the decimal point straight up in the quotient. The result must be either a terminating decimal (one that ends) or a repeating decimal (one with a pattern). Understanding this helps verify if your answer is reasonable.

When working with negative decimals, apply the same rules for signs as with regular integers: different signs yield a negative result, while same signs give a positive result. This consistency in mathematical rules helps maintain accuracy in calculations.

Sign up for free!

Learn faster and better with thousand of available study notes

App

By signing up you accept Terms of Service and Privacy Policy

Dividing Rational Numbers (Fractions and Mixed Numbers) EXAMPLE #2 NOTES EXAMPLE #1 -99 10 299. STQ NO 18 EXAMPLE #3 9-12/0+-2-²/20 (+) 23 3

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Integer Division Fundamentals

Integer division follows specific rules regarding signs and operations. The word "per" in mathematical context often indicates division, making it important to recognize this terminology in word problems.

Example: If you lose 78 points in 13 minutes, to find the points per minute, divide -78 by 13, resulting in -6 points per minute.

Remember that zero divided by any number equals zero, but division by zero is undefined. This is a fundamental rule in mathematics that prevents mathematical contradictions. When writing division problems, they can be expressed using a fraction bar, which helps visualize the relationship between the dividend and divisor.

Sign up for free!

Learn faster and better with thousand of available study notes

App

By signing up you accept Terms of Service and Privacy Policy

Dividing Rational Numbers (Fractions and Mixed Numbers) EXAMPLE #2 NOTES EXAMPLE #1 -99 10 299. STQ NO 18 EXAMPLE #3 9-12/0+-2-²/20 (+) 23 3

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Properties of Mathematical Operations

The commutative property of addition states that the order of addends doesn't affect the sum. This applies to both arithmetic and algebraic expressions.

Vocabulary: Arithmetic expressions involve numbers and operations, while algebraic expressions include variables.

For example, 4 + 6 = 6 + 4, and x + y = y + x demonstrate this property in both arithmetic and algebraic contexts. Understanding these properties helps in simplifying mathematical expressions and solving complex problems more efficiently.

This property is particularly useful when working with multiple terms and variables, as it provides flexibility in how we arrange terms while maintaining mathematical accuracy.

Sign up for free!

Learn faster and better with thousand of available study notes

App

By signing up you accept Terms of Service and Privacy Policy

Dividing Rational Numbers (Fractions and Mixed Numbers) EXAMPLE #2 NOTES EXAMPLE #1 -99 10 299. STQ NO 18 EXAMPLE #3 9-12/0+-2-²/20 (+) 23 3

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Understanding Properties of Mathematical Operations

The associative property of addition states that when adding three or more numbers, the grouping of numbers doesn't affect the final sum. For example, (1 + 2) + 4 gives the same result as 1 + (2 + 4). This fundamental principle helps simplify complex calculations and proves especially useful in algebra.

Definition: The associative property states that (a + b) + c = a + (b + c) for addition, and (a × b) × c = a × (b × c) for multiplication.

When working with rational numbers, the additive inverse property becomes crucial. Every number has an opposite that, when added together, equals zero. This property is essential for solving equations and understanding negative numbers. For instance, 50 + (-50) = 0 demonstrates this principle clearly.

The multiplicative identity property states that any number multiplied by 1 maintains its original value. This seemingly simple concept plays a vital role in fraction operations and algebraic manipulations. For example, -5,486 × 1 = -5,486 shows how this property preserves numerical values.

Sign up for free!

Learn faster and better with thousand of available study notes

App

By signing up you accept Terms of Service and Privacy Policy

Dividing Rational Numbers (Fractions and Mixed Numbers) EXAMPLE #2 NOTES EXAMPLE #1 -99 10 299. STQ NO 18 EXAMPLE #3 9-12/0+-2-²/20 (+) 23 3

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

How to divide rational numbers and fractions

Understanding how to work with rational numbers requires mastery of several key properties. The commutative property of multiplication states that factors can be multiplied in any order without changing the product. For example, 4 × 5 = 5 × 4 = 20.

Example: When multiplying fractions like 2/3 × 3/4, the order doesn't matter: 2/3 × 3/4 = 3/4 × 2/3 = 6/12 = 1/2

The distributive property allows us to "distribute" a factor to terms within parentheses. This property is particularly useful when working with algebraic expressions and mixed numbers. For instance, 5(2 + 3) can be rewritten as 5(2) + 5(3).

When multiplying rational numbers, it's essential to follow specific steps: first convert mixed numbers to improper fractions, then multiply numerators and denominators separately, and finally simplify the result. This systematic approach ensures accurate calculations.

Sign up for free!

Learn faster and better with thousand of available study notes

App

By signing up you accept Terms of Service and Privacy Policy

Dividing Rational Numbers (Fractions and Mixed Numbers) EXAMPLE #2 NOTES EXAMPLE #1 -99 10 299. STQ NO 18 EXAMPLE #3 9-12/0+-2-²/20 (+) 23 3

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Steps for dividing decimals in math

The multiplicative inverse property states that any number multiplied by its reciprocal equals 1. This property forms the foundation for division of fractions, as division by a number is equivalent to multiplication by its reciprocal.

Highlight: When dividing fractions, multiply by the reciprocal of the divisor. For example, to divide by 2/3, multiply by 3/2.

Working with mixed numbers requires careful attention to sign rules. When multiplying or dividing rational numbers with different signs, the result will be negative. For example, -2 2/3 × (-3 2/1) requires converting to improper fractions first, then applying sign rules.

The process of dividing decimals involves similar principles but requires additional attention to decimal point placement. Converting decimals to fractions often simplifies calculations and helps avoid common errors.

Sign up for free!

Learn faster and better with thousand of available study notes

App

By signing up you accept Terms of Service and Privacy Policy

Dividing Rational Numbers (Fractions and Mixed Numbers) EXAMPLE #2 NOTES EXAMPLE #1 -99 10 299. STQ NO 18 EXAMPLE #3 9-12/0+-2-²/20 (+) 23 3

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Understanding the quotient of integers with different signs

When working with integers of different signs, specific rules govern the resulting sign of their quotient. A fundamental principle states that when dividing two numbers with different signs, the result is negative. When dividing two numbers with the same sign, the result is positive.

Vocabulary: Quotient - The result obtained when dividing one number by another. Integer - Any whole number, positive or negative, including zero.

These sign rules extend to more complex operations involving fractions and mixed numbers. For example, when solving -10 ÷ (2/3), first convert the division to multiplication by the reciprocal, then apply the sign rules: -10 × (3/2) = -15.

Understanding these properties and rules allows students to confidently work with rational numbers, whether they appear as fractions, decimals, or mixed numbers. Regular practice with various problem types helps reinforce these concepts and develop mathematical fluency.

Sign up for free!

Learn faster and better with thousand of available study notes

App

By signing up you accept Terms of Service and Privacy Policy

Dividing Rational Numbers (Fractions and Mixed Numbers) EXAMPLE #2 NOTES EXAMPLE #1 -99 10 299. STQ NO 18 EXAMPLE #3 9-12/0+-2-²/20 (+) 23 3

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Understanding How to Multiply Rational Numbers and Decimals

When working with How to divide rational numbers and fractions, it's essential to understand the systematic approach to multiplication. The process involves careful attention to decimal places and sign rules, making it accessible for students at all levels.

The first step in multiplying decimal numbers involves arranging the factors and carefully counting decimal places. For each number being multiplied, count the total number of digits after the decimal point. This count becomes crucial for placing the decimal point correctly in your final answer. For instance, when multiplying -6.5411 by -0.0023, you would first note that the first number has four decimal places, while the second has four decimal places.

Definition: Rational numbers are any numbers that can be expressed as a fraction p/q where p and q are integers and q ≠ 0. This includes decimals, whole numbers, and fractions.

Understanding sign rules is crucial when multiplying rational numbers. When multiplying two negative numbers, the result is positive. When multiplying a positive and negative number, the result is negative. This follows the fundamental rule that negative times negative equals positive, while negative times positive equals negative.

Example: When multiplying 5.8 × (-0.24):

  1. Count decimal places (5.8 has 1, -0.24 has 2, total = 3)
  2. Multiply absolute values: 58 × 24 = 1392
  3. Apply sign rules (positive × negative = negative)
  4. Place decimal point: -1.392

Sign up for free!

Learn faster and better with thousand of available study notes

App

By signing up you accept Terms of Service and Privacy Policy

Dividing Rational Numbers (Fractions and Mixed Numbers) EXAMPLE #2 NOTES EXAMPLE #1 -99 10 299. STQ NO 18 EXAMPLE #3 9-12/0+-2-²/20 (+) 23 3

Sign up to see the content. It's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Working with Powers of Ten and Special Cases in Decimal Multiplication

A special consideration in decimal multiplication involves working with powers of ten, which follows distinct patterns that simplify calculations. When multiplying a decimal by a power of ten (10, 100, 1000, etc.), the process becomes more straightforward than standard decimal multiplication.

The key principle is that for each zero in the power of ten, the decimal point moves that many places to the right in the multiplicand. For example, when multiplying by 100 (which has two zeros), move the decimal point two places to the right. This understanding helps in quickly solving problems involving powers of ten without performing traditional multiplication algorithms.

Highlight: When multiplying by powers of ten, simply move the decimal point right by the number of zeros in the multiplier. For example, 0.642 × 10,000 = 6,420.

Working with mixed numbers and complex decimals requires careful attention to place value and sign rules. Breaking down complex calculations into smaller steps helps maintain accuracy and understanding. For instance, when multiplying -23.579 by -100, first determine the sign (positive since both numbers are negative), then move the decimal point two places right due to the two zeros in 100, resulting in 2,357.9.

Vocabulary: Place value refers to the position of a digit in a number and determines its value in the overall number. Each position represents a power of ten.

Sign up for free!

Learn faster and better with thousand of available study notes

App

By signing up you accept Terms of Service and Privacy Policy

Can't find what you're looking for? Explore other subjects.

Knowunity is the # 1 ranked education app in five European countries

Knowunity was a featured story by Apple and has consistently topped the app store charts within the education category in Germany, Italy, Poland, Switzerland and United Kingdom. Join Knowunity today and help millions of students around the world.

Ranked #1 Education App

Download in

Google Play

Download in

App Store

Knowunity is the # 1 ranked education app in five European countries

4.9+

Average App Rating

15 M

Students use Knowunity

#1

In Education App Charts in 12 Countries

950 K+

Students uploaded study notes

Still not sure? Look at what your fellow peers are saying...

iOS User

I love this app so much [...] I recommend Knowunity to everyone!!! I went from a C to an A with it :D

Stefan S, iOS User

The application is very simple and well designed. So far I have found what I was looking for :D

SuSSan, iOS User

Love this App ❤️, I use it basically all the time whenever I'm studying