Exercise 8 Page 249

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 percent of 70 is equal to 14 by substituting a= 14 and w= 70 into the formula and solve for p% using the Properties of Equality.

a= p% * w

SubstituteII

a= 14, w= 70

14= p% * 70

▼

Solve for p%

DivEqn

.LHS /70.=.RHS /70.

14/70=p% * 70/70

CancelCommonFac

Cancel out common factors

14/70=p% * 70/70

SimpQuot

Simplify quotient

14/70=p%

CalcQuot

Calculate quotient

0.2=p%

RearrangeEqn

Rearrange equation

p%= 0.2

Since 0.2 equals 20%, we can complete percent equation. 14= 20% * 70 We found that 14 is 20 % of 70.

Checking Our Answer

Checking Our Answer

We can use a model to check our answer.