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Big Ideas Math: Modeling Real Life, Grade 7

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

3. The Percent Equation

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Exercise 1 Page 248

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

2

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 10% of 20 is by substituting p%= 10100 and w= 20 into the formula and solve for a using the Properties of Equality.

a= p% * w

p%= 10/100, w= 20

a= 10/100 * 20

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Solve for a

MoveRightFacToNum

a/c* b = a* b/c

a=10* 20/100

Multiply

a=200/100

Calculate quotient

a= 2

Knowing the value of a, let's look at the completed percent equation. 2= 10% * 20 We found that 2 is 10 % of 20.

Checking Our Answer

Checking Our Answer

We can use a model to check our answer.

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