Unit 2 Review

Powers of 10

100

Which expression will the decimals point move to the 2 places to the left? 

a. 14.7 x 10³

b. 14.7 ÷ 10³

c. 14.7 x 10²

d. 14.7 ÷ 10²

d. 14.7 ÷ 10²

200

When multiplied by 10² how much does the place value of 83.45 increase? 

Increases by 2 because 83.45 is multiplied by 100. 

300

18.6 x 10⁶

18,600,000.

400

Which equation is correct?

a. 8.24 ÷ 10³= 8240.

b. 8.24 ÷ 10²= .824

c. 8.24 ÷ 10²= .0824

d. 8.24 ÷ 10¹ =82.4 

c. 8.24 ÷ 10²= .0824

500

What number would go in the blank to make the equation true?

78.372 x _____= 7837.2 

a. 10¹

b. 10²

c. 10³

d. 10⁴

b. 10²

Whole number multiplication

100

42 x 18

756

200

406 x 9

3654

300

63 x 59

3717

400

318 x 262

83316

500

94 x 26

2444

Whole Number Division

100

1892 ÷ 6= 

315 r2

200

An average-sized gray whale eats 9,849 pounds of plankton per week. On average, how much does it eat per day?

1,407 pounds 

300

154 ÷ 7= 

22

400

Astronauts on the space station have 1,320 pounds of food. The next food delivery is five days away. How many pounds of food can the astronauts eat per day?

264 pounds of food

500

1,093 ÷ 9=

121 r4

Multiplying Decimals

100

2.17 x 0.39= 

0.8463

200

23.7 x 12= 

284.4

300

3.17 x 8.2= 

25.994

400

The Anderson's have a booth at the farmer's market they set up each weekend over the summer. They sell homemade apple pies for $9.75 each. On Saturday, they sold 7 pies. How much money did they make selling pies on Saturday?

$68.25

500

They carefully measure out the ingredients to make their pies. Each pie they make has 5.33 cups of apples in the filling. How many cups of apples are in 6 pies?

31.98 cups

Dividing Decimals

100

2.09 ÷ 8= 

0.26 r0.01

200

3.36÷7= 

0.48

300

6.65÷5= 

1.33

400

Katy split a rope that was 49.12 inches into 4 equal parts. What is the length of each part?

12.28 inches

500

Sheena paid $34.11 to buy 9 hot dogs. How much did each hot dog cost?

$3.79