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Decimal Rule
Addition of Decimals
Subtraction of Decimals
Multiplication of Decimals
More multiplying 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

5X0.1=

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

1.6 X100 =

160
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

.98 + 2.67 =

3.65

300
125 - .68 =
124.32
300

.03 x .03 =

.0009

300

0.04 X 2 =

0.08

400

How do you multiply decimals?

You push the decimal point all the way to the right and then bring it back the same amount of times when you get to the answer.


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

8×0.36=

2.88

400

2.4 X 0.01 =

0.024

500

8.07 + .09 + 23.3 =

31.46

500

5.45 - 3.799 =

1.651

500

2.8×4.5=


12.6

500

.45 X 1000

450