Digits, Grade 7, Volume 1, Homework Helper

Topic 9: Percents

9-1: The Percent Equation

Key Concept

You can use the percent equation to solve percent problems.

table with 1 row and 5 columns , row1 column 1 , p eh r t , column 2 equals , column 3 p e r c e n t , column 4 times , column 5 w h o l e , end table

Relating y = mx The percent equation is related to the equation y = mx. It describes the relationship between the part y and the whole x.

Comparing the percent equation to y = mx.

Finding the Part The part is dependent on the value of the whole and on the percent. You can see this relationship using a percent bar.

Comparing a word problem to the percent equation and y = mx, Model of 25%.

Finding the Whole The whole represents 100%.

Comparing a word problem to the percent equation and y = mx, Model of 25%.


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Table of Contents

Digits, Grade 7, Volume 1, Homework Helper Unit A: Number and Operations Unit B: Expressions, Equations, and Relationships Unit C: Measurement and Geometry Unit D: Proportionality English/Spanish Glossary Formulas Math Symbols Formulas Measures Properties