Show:
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 2.1 =

1.26

100
.25 divided by .05 =
5
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 21 =

89.25

200

3.87 divided by .9 =

4.3

300

What do you do if there are not enough digits in the top number to subtract a problem?

You have to add on zero's.

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

.03 x .03 =

.0009

300

.425 divided by .005 =

85

400

How do you multiply decimals?

You multiply the numbers and then you count how many spaces there are to the right of the decimals and count them over to the left in the answer.

400
5 + 2.78 + .030 =
7.81
400
.468 - .059 =
.409
400
2.003 x .05 =
.10015
400

.848 divided by 8 =

.106

500

How do you divide decimals?

You have to get rid of the decimals on the outside by moving the decimals on the inside. Then bring the decimal straight up and divide normally.

500

8.07 + .0976 + 23.3 + 48 =

79.4676

500

5.45 - 3.799 =

1.651

500

.312 x 1.67 =

.52104

500

.4564 divided by .04

11.41