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

3.982 x 10

39.82

100

7.89/10

.789

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

67.08 x 1000

67080

200

3.87/100

.0387

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

1620 x 0.01

16.20

300

17.092/10 000

.0017092

400

How do you multiply decimals?

...

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

15 x 10 000

150000

400

78/0.01

7800.

500

How do you divide decimals?

...

500
8.07 + .0976 + 23.3 + 48 =
79.4676
500
5.45 - 3.799 =
1.651
500
15 x .001

0.015

500

1827/0.001

182700.

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