10 printable sets · answer key on every set

Decimal Operations Worksheets

CCSS 5.NBT.B.7
20 problems per set
Answer key included

What this skill is

Adding, subtracting and multiplying numbers with decimals.

When it comes up: Fifth grade.

The mistake to watch for

Lining up the last digits instead of the decimal points, so tenths get added to hundredths.

How to help

Write the numbers in a column with the points exactly under each other, and use zeros as placeholders (2.7 becomes 2.70).

Next: Dividing with decimals in sixth grade.

A worked example

Try 3.45 + 2.7. Line up the decimal points and write 2.7 as 2.70: 3.45 + 2.70 = 6.15. For 3.2 × 4: 32 × 4 = 128, and one decimal place goes back in, so the answer is 12.8.

Words to know

decimal: A number written with a point to show parts smaller than one, like 0.5.
tenths: The first place after the decimal point. 0.3 means 3 tenths.
hundredths: The second place after the decimal point. 0.07 means 7 hundredths.
place: Where a digit sits in a number: ones, tens or hundreds.
estimate: To find an answer that is close, without doing the exact work.

Practice

Add, subtract or multiply.

Showing Set 1 · 20 problems

9.5 × 9 = ___
9.8 × 7 = ___
3.42 − 1.95 = ___
6.13 + 7.58 = ___
1.5 × 3 = ___
9.4 − 6.59 = ___
6.7 × 8 = ___
7.8 × 2 = ___
6.14 − 1.72 = ___
7.2 − 5.81 = ___
4.16 − 2.76 = ___
7.59 − 4.36 = ___
2.02 − 1.49 = ___
5.6 × 8 = ___
2 × 2 = ___
4.8 × 6 = ___
9.75 − 5.47 = ___
2.11 + 5.73 = ___
6.7 × 4 = ___
8.56 + 7.46 = ___

Download this set20 problems · answer key included PDF

Answer key

85.5
68.6
1.47
13.71
4.5
2.81
53.6
15.6
4.42
1.39
1.4
3.23
0.53
44.8
4
28.8
4.28
7.84
26.8
16.02

All 10 sets

Each set is a different list of 20 problems with its own answer key. Use the buttons above to look at one on this page, or download any of them as a PDF.

How these sheets were made

Problems are generated for each set and checked against 5.NBT.B.7 before the sheet is built — no duplicates, and every problem falls inside the standard's number range.