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Decimal Addition Worksheets — Free Printable

Decimal addition is where place value extends past the ones column. These worksheets generate numbers with a fixed number of decimal places (tenths or hundredths) so students practice lining up the decimal point — the classic step that trips up learners. Turn hundredths on for a harder set.

Sample problems (new ones below)

5.61 + 1.13 = → 6.744.09 + 5.11 = → 9.206.38 + 7.88 = → 14.265.35 + 1.19 = → 6.543.94 + 9.67 = → 13.611.90 + 1.43 = → 3.332.14 + 6.65 = → 8.798.25 + 9.87 = → 18.128.70 + 7.90 = → 16.608.06 + 8.63 = → 16.697.83 + 4.29 = → 12.121.75 + 9.59 = → 11.342.31 + 7.40 = → 9.712.50 + 6.07 = → 8.574.30 + 4.13 = → 8.435.61 + 8.53 = → 14.146.44 + 3.39 = → 9.831.84 + 7.58 = → 9.422.96 + 1.80 = → 4.765.48 + 6.99 = → 12.471.96 + 1.39 = → 3.358.56 + 7.37 = → 15.931.50 + 3.64 = → 5.144.50 + 8.07 = → 12.57

Worksheet controls

Common Core aligned: 2.OA.B.2, 2.NBT.B.5, 2.NBT.B.7

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Decimals
Name: _______________  ·  Date: _______________
unitfig.com/math-worksheets/decimals · free printable
1.9.84 + 1.01 =
2.4.16 + 2.91 =
3.1.94 + 4.43 =
4.1.16 + 8.48 =
5.7.97 + 9.65 =
6.3.47 + 4.86 =
7.1.77 + 2.75 =
8.2.45 + 6.44 =
9.1.94 + 8.67 =
10.2.97 + 2.87 =
11.8.82 + 9.29 =
12.4.50 + 2.58 =
13.2.93 + 1.00 =
14.9.63 + 5.81 =
15.3.17 + 5.69 =
16.1.53 + 7.65 =
17.2.87 + 8.78 =
18.2.69 + 8.09 =
19.1.18 + 6.02 =
20.1.25 + 2.12 =
21.9.28 + 3.89 =
22.9.14 + 8.20 =
23.8.70 + 7.30 =
24.2.36 + 6.41 =
Answer Key
1. 10.85(Rounded to 2 decimal places.)
2. 7.07(Rounded to 2 decimal places.)
3. 6.37(Rounded to 2 decimal places.)
4. 9.64(Rounded to 2 decimal places.)
5. 17.62(Rounded to 2 decimal places.)
6. 8.33(Rounded to 2 decimal places.)
7. 4.52(Rounded to 2 decimal places.)
8. 8.89(Rounded to 2 decimal places.)
9. 10.61(Rounded to 2 decimal places.)
10. 5.84(Rounded to 2 decimal places.)
11. 18.11(Rounded to 2 decimal places.)
12. 7.08(Rounded to 2 decimal places.)
13. 3.93(Rounded to 2 decimal places.)
14. 15.44(Rounded to 2 decimal places.)
15. 8.86(Rounded to 2 decimal places.)
16. 9.18(Rounded to 2 decimal places.)
17. 11.65(Rounded to 2 decimal places.)
18. 10.78(Rounded to 2 decimal places.)
19. 7.20(Rounded to 2 decimal places.)
20. 3.37(Rounded to 2 decimal places.)
21. 13.17(Rounded to 2 decimal places.)
22. 17.34(Rounded to 2 decimal places.)
23. 16.00(Rounded to 2 decimal places.)
24. 8.77(Rounded to 2 decimal places.)

Teaching tips for decimals

  • •Always line up the decimal points before adding — the digits after the decimal point align by place value just like whole numbers.
  • •Model "fill with zeros": 0.3 + 0.25 → 0.30 + 0.25. Writing the trailing zero makes the columns visually match.
  • •Estimate first: 0.3 + 0.25 should be "about half". Estimation catches off-by-one decimal errors immediately.

Common mistakes to watch for

✗ Aligning by the right edge of the number instead of the decimal point (0.3 + 0.25 → 0.55 instead of 0.55… actually 0.3 aligns under 0.2).
✓ Physically draw a vertical line under the decimal points before adding. That line IS the alignment rule.
✗ Writing the wrong number of decimal places in the sum.
✓ The sum has the same number of decimal places as the addends (both set to the same precision here), so check the count before writing the answer.

Check your answers with the tools

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Frequently Asked Questions

What is the difference between tenths and hundredths?

Tenths have one decimal place (0.1, 0.2…), hundredths have two (0.01, 0.25…). Start with tenths, then switch to hundredths for a challenge.

What grade is decimal addition taught?

Decimal notation is introduced in grade 4 (4.NF.C.6) and operations with decimals are formalized in grade 5 (5.NBT.B.7).

Are the answers exact?

Yes. The engine works with integer math behind the scenes and places the decimal point once at the end, so there are no floating-point rounding surprises.

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Last Updated 2026 | Problems are algorithm-generated with the exact NIST/SI constants used by UnitFig converters. Answers are computed programmatically and can be verified with the matching converter.