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Big Ideas Math: Modeling Real Life, Grade 7

BI

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

3. The Percent Equation

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Exercise 9 Page 249

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

30.6

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 36% of 85 is by substituting p%= 36100 and w= 85 into the formula and solve for a using the Properties of Equality.

a= p% * w

p%= 36/100, w= 85

a= 36/100 * 85

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Solve for a

MoveRightFacToNum

a/c* b = a* b/c

a=36* 85/100

Multiply

a=3060/100

Calculate quotient

a= 30.6

Knowing the value of a, let's look at the completed percent equation. 30.6= 36% * 85 We found that 30.6 is 36 % of 85.

Subchapter links

Try It p.248-249

Self-Assessment for Concept & Skills p.249

Self-Assessment for Problem Solving p.250

Review & Refresh p.251

Concept, Skills, & Problem Solving p.251-252