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Big Ideas Math: Modeling Real Life, Grade 7 View details

3. The Percent Equation

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Exercise 10 Page 249

The percent equation is an equation in which the part is equal to the product of the corresponding percent and the whole.

Practice makes perfect

The percent equation is an equation in which the part is equal to the product of the corresponding percent and the whole. We can represent a is p percent of wwith the following equation. a= p% * wWe can find what number's 12% is equal to 9 by substituting p%= 0.12 and a= 9 into the formula and solve for w using the Properties of Equality.

a= p% * w

SubstituteII

p%= 0.12, a= 9

9= 0.12 * w

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Solve for w

DivEqn

.LHS /0.12.=.RHS /0.12.

9/0.12=0.12* w/0.12

CancelCommonFac

Cancel out common factors

9/0.12=0.12* w/0.12