Mastering Problem-Solving and Data Analysis for SAT & PSAT

Problem Solving and Data Analysis

Ever wonder how to quickly calculate a tip or figure out the average test score you need to pass a class? Problem solving in math uses specific techniques that make these calculations straightforward.

Percentages can be converted to make calculations easier. Turn a percentage into a decimal by moving the decimal point two places left $300$. When working with variables, convert to a fraction instead: x% = x/100. Remember that "of" in percentage problems means multiplication by that fraction.

💡 When you see a problem like "5% of what number is 9," you're solving the equation $5/100$ × n = 9, where n is your unknown value.

Averages are calculated by finding the sum of all numbers and dividing by how many numbers you have. This concept appears everywhere from calculating GPAs to understanding sports statistics.

When working with variation in math problems, remember two key relationships: direct variation means values increase together (as one goes up, so does the other), while inverse variation means when one value increases, the other decreases.