Number Systems: Decimals

Adding and Subtracting

100

23.1 + 78.05

101.15

200

56.08 - 45.07

11.01

300

1,046.376 - 821.613

224.763

400

.61 + 4.1 + 8 + 10 + .9 + 10

33.61

500

5.948 - 3.080

2.868

Multiplying

100

36 x 0.42

15.12

200

6.04 x 23

138.92

300

10.21 x 2.01

20.5221

400

0.94 x 89.1

83.754

500

7.2 x 10.6

76.32

Dividing

100

759 -: 0.3

2,530

200

17.696 -: 2.8

6.32

300

202.0 -: .5

404

400

77.5 -: 3.1

25

500

102.48 -: 1.4

73.2

Greatest Common Factor

100

What is the GCF of 28 and 21?

7

200

What is the GCF of 19 and 38?

19

300

What is the GCF of 200 and 25?

25

400

What is the GCF of 44 and 86?

2

500

What is the GCF of 6, 24, and 42?

6

Least Common Multiple

100

For the following numbers, what is the least common multiple:

20 and 10

20

200

For the following numbers, what is the least common multiple:

12 and 2

12

300

For the following numbers, what is the least common multiple:

5 and 8

40

400

For the following numbers, what is the least common multiple:

3 and 9

18

500

For the following numbers, what is the least common multiple:

4, 7, and 14

28