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 =

12.6

100

2.5 divided by 5 =

0.5

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 =

0.43

300

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

You have to add on zero's.

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

3 x .03 =

.09

300

42.5 divided by 5 =

8.5

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

200.3 x 5 =

1,001.5
400

8.48 divided by 8 =

1.06

500

How do you divide decimals?

Move the decimal point up then use long division.

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

312.5 x 7 =

2,187.5

500

456.4 divided by 4

114.1