Quiz about Using Rounding to Estimate (2 by 2 multiplication)

Question 1

31 x 12

31 rounds to 30

12 rounds to 10

______ x ______= _______

Accepted Answer

30x10=300

Answer

30x12=300

Answer

31x10=310

Question 2

28x17

28 rounds to 30

17 rounds to 20

30x20=_____

Accepted Answer

600

Answer

60

Answer

6

Answer

6,000

Question 3

45x19

ROUND first!

Accepted Answer

1,000

Answer

100

Answer

10

Question 4

34x48

ROUND first!

Accepted Answer

1,500

Answer

150

Answer

15

Question 5

39x37

ROUND first!

Accepted Answer

1,600

Answer

16

Answer

160

Question 6

25x81

ROUND first!

Accepted Answer

2,400

Answer

240

Answer

24

Question 7

64x76

ROUND first!

Accepted Answer

4,800

Answer

480

Answer

48

Question 8

88x23

ROUND first!

Accepted Answer

1,800

Answer

18

Answer

180

Question 9

About how many books in all does Corner Books sell each year? Remember, there are 52 weeks in a year. (multi-step problem)

Accepted Answer

8,500 books

Answer

6,120 books

Answer

4,780 books

Question 10

A deep-sea fisherman went fishing 14 times last month. He caught 28 fish each time. About how many fish did he catch altogether last month?

Accepted Answer

About 300 fish

Answer

About 200 fish

Answer

About 400 fish

Question 11

The world's smallest snake, the thread snake, can be 4 inches long. The world's largest snake, the anaconda, can be 60 times as long. How many inches long can an anaconda be?

Accepted Answer

240 inches

Answer

320 inches

Answer

560 inches

Question 12

Accepted Answer

1,200 eggs

Answer

80 eggs

Answer

120 eggs

Answer

800 eggs

Using Rounding to Estimate (2 by 2 multiplication)

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