Add/Subtract Decimals
When adding or subtracting decimals, do you line up the numbers or the decimals?
The decimals
When multiplying decimals, do you line up the numbers or the decimals?
The numbers
Do we ever divide by a decimal?
No! Change the divisor to a whole number.
(Calculator to simplify)
5/6 x 9/10
3/4
(Calculator to simplify)
9 ÷ 4/5
11 1/4
NO CALCULATOR:
Add 54.6 + 43.79
98.39
NO CALCULATOR:
Multiply 2.37 x 1.2
2.844
Whatever we do to the divisor, we must also to do the _____.
Dividend
(Calculator to simplify)
3 1/5 x 2/3
2 2/15
(Calculator to simplify)
5/14 ÷ 4/7
5/8
NO CALCULATOR:
Subtract 89.74 - 62.8
26.94
NO CALCULATOR:
Multiply 5.61 x 2.7
15.147
(Calculator to check steps only. No remainders, only decimals.)
Divide 56 ÷ 5
11.2
(Calculator to simplify)
5 1/3 x 3
16
(Calculator to simplify)
3 5/6 ÷ 9 5/6
23/59
NO CALCULATOR:
Add 63.8 + 71.62
135.42
NO CALCULATOR:
Multiply 36.4 x 4.2
152.88
(Calculator to check steps only. No remainders, only decimals.)
Divide 2.45 ÷ 0.07
35
(Calculator to simplify)
4 1/8 x 5 1/2
22 11/16
(Calculator to simplify)
2 5/8 ÷ 13
21/104
NO CALCULATOR:
Subtract 407.3 - 251.39
155.91
NO CALCULATOR:
Multiply 5.49 x 2.64
14.4936
(Calculator to check steps only. No remainders, only decimals.)
Divide 8.9 ÷ 0.4
22.25
(Calculator to simplify)
2 1/6 x 4 1/2
9 3/4
(Calculator to simplify)
3 6/7 ÷ 6 3/4
4/7