Homework book pages 42-43

1) Label each example with the mental math strategy it represents.:halving , doubling , dividing by ten. Then , complete the calculation

a) 1% of 66%

10% of 66% = $6.60

so, 1% of 66 = $0.66 dividing by 10

b) 5% of 180

10% of 180 = 18

So, 5% of 180 = 9 halving

c) 20% of $3.20

10% of $3.20 = $0.32

So, 20% of $3.20 = $0.64 doubling

2) Circle the terms that correctly complete this statement. To calculate the percent of the number, write the percent as a (decimal/percent), and then (divide/multiply by the number.

Answer: it would be divide then multiple.

3) Use the mental math to determine each of the following. show you thinking.

a) 200% or 4500

Answer :900 doubling

b) 0.1% or 600

Answer : 0.6

c) 1 1/4% of 80

Answer :1 halving

d) 30% of 70

Answer :21 divided by 10

e) 4/5% of 15

Answer :12 doubling by 10

f) 450% of 300

Answer :1350 doubling, halving

4) What is the percent of each number? Give you answer to the nearest hundredth.

a) 1/5% of 630

Answer:1.26

b) 23 7/8 of 300

Answer:71.63

c) 245% of $356

Answer:$874.16

d) 68 3/4 of 730

Answer:501.88

e)360% of $129.95

Answer:$467.82

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