Exercise 6 Page 358

We want to estimate 18 % of 48. We will start by rounding each number. c|c 18is closer to20 & 48is closer to50 than to10 & than to40 ⇓ & ⇓ 18 % ≈ 20 % & 48≈ 50Now we multiply the rounded numbers to get an estimation. First, we write the percent as a fraction.

20 %* 50

WriteAsFrac

Write as a fraction

20/100 * 50

ReduceFrac

a/b=.a / 20./.b / 20.

20÷ 20/100÷ 20 * 50

CalcQuot

Calculate quotient

1/5 * 50

MoveRightFacToNumOne

1/b* a = a/b

50/5

CalcQuot

Calculate quotient

10

Now we are ready to complete the exercise. 18 % ≈ 20 % 48 ≈ 50 20 % of 50 = 10 We found that 18 % of 48 is about 10.