Exercise 11 Page 359

We want to estimate 8 % of 576. We will start by rounding each number. c|c 8is closer to10 & 576is closer to580 than to5 & than to570 ⇓ & ⇓ 8 % ≈ 10 % & 576≈ 580Now we multiply the rounded numbers to get an estimation. First, we write the percent as a fraction.

10 %* 580

WriteAsFrac

Write as a fraction

10/100 * 580

ReduceFrac

a/b=.a / 10./.b / 10.

10÷ 10/100÷ 10 * 580

CalcQuot

Calculate quotient

1/10 * 580

MoveRightFacToNumOne

1/b* a = a/b

580/10

CalcQuot

Calculate quotient

58

Now we are ready to complete the exercise. 8 % ≈ 10 % 576 ≈ 580 10 % of 580 = 58 We found that 8 % of 576 is about 58.