Exercise 10 Page 359

We want to estimate 74 % of 63. We will start by rounding each number. c|c 74is closer to75 & 63is closer to60 than to70 & than to70 ⇓ & ⇓ 74 % ≈ 75 % & 63≈ 60Now we multiply the rounded numbers to get an estimation. First, we write the percent as a fraction.

75 %* 60

WriteAsFrac

Write as a fraction

75/100 * 60

ReduceFrac

a/b=.a / 25./.b / 25.

75÷ 25/100÷ 25 * 60

CalcQuot

Calculate quotient

3/4 * 60

MoveRightFacToNum

a/c* b = a* b/c

180/4

CalcQuot

Calculate quotient

45

Now we are ready to complete the exercise. 74 % ≈ 75 % 63 ≈ 60 75 % of 60 = 45 We found that 74 % of 63 is about 45.