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5th Grade · Session 5 of 10

Decimal Addition & Subtraction

Add and subtract decimals. Line up the decimal points so that tenths align with tenths, hundredths with hundredths, and so on.

A

Addition

Line up the decimal points, then add column by column.

1
4.75+3.84.75 + 3.8
=
2
6.4+2.836.4 + 2.83
=
3
0.75+2.3+0.480.75 + 2.3 + 0.48
=
4
3.6+4.95+1.23.6 + 4.95 + 1.2
=
B

Subtraction

Line up the decimal points. Add zeros as placeholders where needed.

5
12.3−7.6512.3 - 7.65
=
6
15.0−8.4715.0 - 8.47
=
7
20.4−13.8520.4 - 13.85
=
8
100.0−43.7100.0 - 43.7
=
C

Word Problems

Write the equation, then solve.

9

A water bottle holds 1.51.5 litres. In the morning you drink 0.650.65 litres and in the afternoon you drink 0.480.48 litres. How much water is left?

=
10

Three books weigh 1.351.35 kg, 0.90.9 kg, and 2.072.07 kg. What is their total weight?

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