Decimal Rule
Addition of Decimals
Subtraction of Decimals
Multiplication of Decimals
Division of Decimals
100
How do you add decimals?
You line up the decimals and then add the numbers.
100
58.9 + 3.04 =
61.94
100
3.95 - 2.7 =
1.25
100

.6 x 10 =

6

100

.25 divided by 10 =

0.025

200
How do you subtract decimals?
You line up the decimals and then subtract the numbers.
200
.004 + 5.1 =
5.104
200
95.29 - 1.3 =
93.99
200

4.25 x 100 =

425

200

3.87 divided by 100 =

0.0387

300

How do you multiply or divide using 0.1, 0.01, 0.001, etc?

you have to count the zeros and move the decimal to the right for division of a decimal and to the left for multiplication of a decimal.

300
.9843 + 2.67 =
3.6543
300
125 - .68 =
124.32
300

.03 x 10 =

0.3

300

677.425 divided by 1000  =

0.677425

400

How do you multiply decimals by 10, 100, 1000, etc?

You count the zeros and move the decimal over to the right that many times 

400
5 + 2.78 + .030 =
7.81
400
.468 - .059 =
.409
400

2.003 x 0.1 =

.20030

400

.848 divided by 10 =

.0848

500

How do you divide decimals by 10, 100, 1000, etc?

You count the zeros and move the decimal over that many time to the left

500
8.07 + .0976 + 23.3 + 48 =
79.4676
500
5.45 - 3.799 =
1.651
500

.312 x 50 =

156

500

.4564 divided by 0.01

45.64

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