Math Unit 4 Review

Multiplying Whole Numbers

100

52 x 76 = 

3,952

200

85 x 37 =

3,145

300

386 x 23 =

8,878

400

972 x 12 = 

11,664

500

1,234 x14 = 

17,276

Multiplying Decimals

100

1.2 x 0.8 = 

0.96

200

2.4 x 0.8 =

1.92

300

4.12 x 6.1 =

25.132

400

7.89 x 1.2 =

9.468

500

98.76 x 1.23

121.4748

Word Problems

100

Mrs. Lewis is knitting a sweater. She buys 15 skeins of yarn. Each skein costs $4.10. How much money does she spend?

$61.50

200

Mark is painting a wall in his bedroom. The wall is 8.2 feet long and 9.3 feet high. To find out how much paint to buy, he needs to find the area of the wall. What is the area of the wall?

76.26 square feet

300

Eliza is re-carpeting her TikTok dance studio. The floor is 10.7 feet by 12.8 feet. How much carpet will she need?

136.96 square feet

400

Olivia is buying toys for her dogs. Each toy costs $5.79. If she buys 12 toys, how much does she spend?

$69.48

500

Mrs. Lewis bout 4 of Carson's puppies. If they cost $432.98 each, how much did Mrs. Lewis spend?

$1,731.92

Powers of Ten

100

52 x 10² 

5,200

200

4.7 x 10⁴ 

47,000

300

963.25 x 10⁵

96,325,000

400

14.7558 x 10³

1,4755.8

500

123.456789 x 10⁵

12,345,678.9

Shifting Decimals

100

76 x 0.1

7.6

200

486 x 0.01

4.86

300

75.623 x 0.001

0.075623

400

1,283.629 x 0.001

1.283629

500

987654321.123456 x 0.000001

987.654321123456