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.
5/6 x 9/10
3/4
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
3 1/5 x 2/3
2 2/15
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
Divide 56 ÷ 5
11.2
5 1/3 x 3
16
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
Divide 2.45 ÷ 0.07
35
4 1/8 x 5 1/2
22 11/16
2 5/8 ÷ 13
21/104
NO CALCULATOR:
Subtract 407.3 - 251.39
155.91
NO CALCULATOR:
Multiply 5.4 x 4
21.6
Divide 8.9 ÷ 0.4
22.25
2 1/6 x 4 1/2
9 3/4
3 6/7 ÷ 6 3/4
4/7