Process
How do you add decimals?
You line up the decimals in the problem, drop it down into the answer, then add normally.
6.75 + 1.1 =?
7.85
5.2/2=?
2.6
1.0 X 1.0=?
1
5.5-5.5=?
0
How do you subtract decimals?
You line up the decimals in the problem, drop it down into the answer, then subtract normally.
5.50 + 4.50 =?
10
6.2 / 3.1=?
2
6.2 X 3.0 =?
18.6
4.3
How do you multiply decimals?
You multiply normally, once you get your answer, look and see how many digits there are behind the decimal point in the problem. However digits there are total that's how many you put behind the decimal in your answer.
10.67 + 11.35=?
22.2
9.6/4=?
2.4
5.5 X 6.7 =?
36.85
10.23 - 2.20=?
8.3
How do you divide decimals?
You move the decimal point to the right to make the divisor a whole number. However many times you move the decimal in the divisor you have to move it that many times in the dividend.
20.98 + 12.3=?
33.1
4.5 / 3=?
1.5
7.92 X 3.4=?
24.8688
40.90-30.90=?
10
Do you line up decimals to multiply them?
No
400.99 + 599.1 =?
1,000
10.99 / 5 =?
2.198
4.5 X 6.7 =?
30.15
34.7- 9.80=?
24.9