Chapter 3 Review Ijames

3A: Add/Subtract

100

3.4   +  2.5 

5.9

200

6.72   +   8.4

15.12

300

124.223   +   9.79

134.013

400

57.94   -   28.65

29.29

500

238.6   -   53.14

185.46

3B: Multiply

100

7.5  x  8

60

200

8.6   x   10

86

300

1.25   x   14

17.5

400

32.6   x   1.5

48.9

500

5.44   x   9.7

52.768

3C: Divide

100

58   ÷   3  (remainder)

19  R1

200

658  ÷  4   (remainder)

164  R2

300

58.4   ÷   4

14.6

400

12.8  ÷  3

4.266666666.....

500

29.629  ÷  .3

98.763333333......

3D: Estimate

100

Estimate 

7.8  x  7 ≈  ?

56

200

Estimate

8.4  x  12.5  ≈  ?

round to whole numbers

104

300

Estimate

44.7  ÷  8.4  ≈  ?

round 44.7 to nearest 10, and 8.4 to nearest whole number.

5

400

Estimate

88.2  ÷  1.6  ≈ ?

round 88.2 to nearest 10, and 1.6 to nearest whole number.

45

500

What is 43.9  ÷  7.4 if I round both numbers to the nearest 10?

40  ÷  10  =  4

Vocabulary

100

When I add or subtract decimals, I must make sure that the __________  __________ are lined up.

decimal points

200

The answer to a multiplication problem is called the ____________.

product

300

The second number in a division problem is called the _________.

divisor

400

A wavy equal sign (≈) means __________  ________  _____.

approximately equal to

500

What place values are four places to the left of a decimal point and four places to the right of a decimal point?

thousands and ten-thousandths