Pre Algebra Percents Worksheets PDF
6.3 The Percent Proportion Using Bar Diagrams
Finding Part of a Whole
You can write a proportion by using a double-sided number line. To find 25% of 124:
0% X 25 (124) = 100(160x)
31 = x
When Finding the "Part"
When finding the "part," you are looking for what the percent of the whole is equal to. To find 25% of 124:
124/122 = x/100
x = 25
A percent can be written as "part" Over 100. The "of" usually follows the word "of."
Finding the Percent
To find out what percent of 15 is 14, we can use the equation:
14/100 = (15/x)
x = 43.30
When finding the percent, you need to identify what is the "part" and what is the "whole."
Finding the Whole
To find out 207 is 46⁰% of what number, we can use the equation:
207/46 = x/100
x = 450
When finding the "whole," you are given a percent and a "part."
6.4 The Percent Equation
What It Says
It says "is" of what number. It means x (multiply) n.
Finding the Part Using Equations
When solving percent problems using equations, you have to translate certain keywords. For example, what is 15% of 40?
n = 0.15 x 40
n = 6
To calculate, you HAVE to change the percent into a decimal or fraction.
Finding the Percent Using Equations
When finding the percent, it should be clear that you are looking for a percent as an answer. Make sure you convert correctly. For example, what percent of 40 is 6?
6/40 = 0.15
P = 15%
Finding the Whole Using Equations
When finding the "whole," you are given a percent and a "part." For example, what is the whole when 6 is 15% of it?
6 = 0.15 x P
P = 40
