Adding Decimals
Subtracting Decimals
Multiplying Decimals
Dividing Decimals by Decimals
Dividing Decimals by Whole Numbers
100

What is the first thing you do before adding any decimals?

Line up the decimals!

100

What is the first thing you do before subtracting any decimals?

Line up the decimals!

100

What is the first thing you do before multiplying any decimals?

Move the decimal all the way to the end.

100

What is the first thing you do before dividing decimals?

If the divisor is a decimal, you must move it all the way to the right. You do the same for the dividend. Then you must line up the decimal on top of the dividend.

100

True or False. You must move the decimal for whole numbers

False.

200
23.4 + 1.4

24.8

200

54.6 - 2.6

52

200

True or False. You need to move the decimal for whole numbers.

False

200

9.6 / 1.2

8

200

6.7 x 4

26.8

300

67.22 + 23.7

90.92

300

34.12 - 2.67 

31.45

300

23.4 x 5.6

131.04

300

57.8 / 3.4

17

300

How many times do you move the decimal back for 45.67 x 3?

Two times.

400

134.56 + 321.1

455.66

400

148.29 - 87.77

60.52

400

1.04 x 4.56

4.7424

400

15.6 / .78

20

400

4.67 x 4 

18.68

500

You go to the store and buy a hammer for 25.99 and a wrench for 13.45. What is your total?

39.44

500

You walk in the Samsung store and buy the latest Galaxy smartphone. It costs 867.94. You give $1000. How much change do you receive?

132.06

500

3.442 x 1.3

4.4746

500

42 / 3.75

11.2

500

123.4 x 5

617