Homework book

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