Adding Decimals
What is the first thing you do before adding any decimals?
Line up the decimals!
What is the first thing you do before subtracting any decimals?
Line up the decimals!
What is the first thing you do before multiplying any decimals?
Move the decimal all the way to the end.
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.
True or False. You must move the decimal for whole numbers
False.
24.8
54.6 - 2.6
52
True or False. You need to move the decimal for whole numbers.
False
9.6 / 1.2
8
6.7 x 4
26.8
67.22 + 23.7
90.92
34.12 - 2.67
31.45
23.4 x 5.6
131.04
57.8 / 3.4
17
How many times do you move the decimal back for 45.67 x 3?
Two times.
134.56 + 321.1
455.66
148.29 - 87.77
60.52
1.04 x 4.56
4.7424
15.6 / .78
20
4.67 x 4
18.68
You go to the store and buy a hammer for 25.99 and a wrench for 13.45. What is your total?
39.44
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
3.442 x 1.3
4.4746
42 / 3.75
11.2
123.4 x 5
617