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MathsAges 10-12

Decimal addition

Add numbers in tenths. Keep the decimal places aligned as you calculate. Review suitability for your learners before teaching.

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Worksheet StudioPractice pack · Ages 10-12

Decimal addition

Take your time. Show your thinking.

  1. 1. 6.5 + 2.7 = ____

    6.5 · 2.7 · Decimal addition

  2. 2. 7.5 + 4.3 = ____

    7.5 · 4.3 · Decimal addition

  3. 3. 10.6 + 2.2 = ____

    10.6 · 2.2 · Decimal addition

  4. 4. 11.3 + 6.8 = ____

    11.3 · 6.8 · Decimal addition

  5. 5. 1.9 + 1.0 = ____

    1.9 · 1.0 · Decimal addition

  6. 6. 3.4 + 9.0 = ____

    3.4 · 9.0 · Decimal addition

  7. 7. 3.7 + 5.5 = ____

    3.7 · 5.5 · Decimal addition

  8. 8. 15.7 + 7.3 = ____

    15.7 · 7.3 · Decimal addition

  9. 9. 17.2 + 8.7 = ____

    17.2 · 8.7 · Decimal addition

  10. 10. 19.8 + 12.5 = ____

    19.8 · 12.5 · Decimal addition

  11. 11. 13.1 + 10.0 = ____

    13.1 · 10.0 · Decimal addition

  12. 12. 3.2 + 1.4 = ____

    3.2 · 1.4 · Decimal addition
12 questions · Seed 104729 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 10-12

Decimal addition

Answers and reasoning. Review before teaching.

  1. 1. 6.5 + 2.7 = ____

    9.2

    Add 65 tenths and 27 tenths to get 92 tenths.

  2. 2. 7.5 + 4.3 = ____

    11.8

    Add 75 tenths and 43 tenths to get 118 tenths.

  3. 3. 10.6 + 2.2 = ____

    12.8

    Add 106 tenths and 22 tenths to get 128 tenths.

  4. 4. 11.3 + 6.8 = ____

    18.1

    Add 113 tenths and 68 tenths to get 181 tenths.

  5. 5. 1.9 + 1.0 = ____

    2.9

    Add 19 tenths and 10 tenths to get 29 tenths.

  6. 6. 3.4 + 9.0 = ____

    12.4

    Add 34 tenths and 90 tenths to get 124 tenths.

  7. 7. 3.7 + 5.5 = ____

    9.2

    Add 37 tenths and 55 tenths to get 92 tenths.

  8. 8. 15.7 + 7.3 = ____

    23.0

    Add 157 tenths and 73 tenths to get 230 tenths.

  9. 9. 17.2 + 8.7 = ____

    25.9

    Add 172 tenths and 87 tenths to get 259 tenths.

  10. 10. 19.8 + 12.5 = ____

    32.3

    Add 198 tenths and 125 tenths to get 323 tenths.

  11. 11. 13.1 + 10.0 = ____

    23.1

    Add 131 tenths and 100 tenths to get 231 tenths.

  12. 12. 3.2 + 1.4 = ____

    4.6

    Add 32 tenths and 14 tenths to get 46 tenths.

12 questions · Seed 104729 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 10-12

Decimal addition

Take your time. Show your thinking.

  1. 1. 6.5 + 2.7 = ____

    6.5 · 2.7 · Decimal addition

  2. 2. 7.5 + 4.3 = ____

    7.5 · 4.3 · Decimal addition

  3. 3. 10.6 + 2.2 = ____

    10.6 · 2.2 · Decimal addition

  4. 4. 11.3 + 6.8 = ____

    11.3 · 6.8 · Decimal addition

  5. 5. 1.9 + 1.0 = ____

    1.9 · 1.0 · Decimal addition

  6. 6. 3.4 + 9.0 = ____

    3.4 · 9.0 · Decimal addition

  7. 7. 3.7 + 5.5 = ____

    3.7 · 5.5 · Decimal addition

  8. 8. 15.7 + 7.3 = ____

    15.7 · 7.3 · Decimal addition

  9. 9. 17.2 + 8.7 = ____

    17.2 · 8.7 · Decimal addition

  10. 10. 19.8 + 12.5 = ____

    19.8 · 12.5 · Decimal addition

  11. 11. 13.1 + 10.0 = ____

    13.1 · 10.0 · Decimal addition

  12. 12. 3.2 + 1.4 = ____

    3.2 · 1.4 · Decimal addition
12 questions · Seed 104729 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 10-12

Decimal addition

Answers and reasoning. Review before teaching.

  1. 1. 6.5 + 2.7 = ____

    9.2

    Add 65 tenths and 27 tenths to get 92 tenths.

  2. 2. 7.5 + 4.3 = ____

    11.8

    Add 75 tenths and 43 tenths to get 118 tenths.

  3. 3. 10.6 + 2.2 = ____

    12.8

    Add 106 tenths and 22 tenths to get 128 tenths.

  4. 4. 11.3 + 6.8 = ____

    18.1

    Add 113 tenths and 68 tenths to get 181 tenths.

  5. 5. 1.9 + 1.0 = ____

    2.9

    Add 19 tenths and 10 tenths to get 29 tenths.

  6. 6. 3.4 + 9.0 = ____

    12.4

    Add 34 tenths and 90 tenths to get 124 tenths.

  7. 7. 3.7 + 5.5 = ____

    9.2

    Add 37 tenths and 55 tenths to get 92 tenths.

  8. 8. 15.7 + 7.3 = ____

    23.0

    Add 157 tenths and 73 tenths to get 230 tenths.

  9. 9. 17.2 + 8.7 = ____

    25.9

    Add 172 tenths and 87 tenths to get 259 tenths.

  10. 10. 19.8 + 12.5 = ____

    32.3

    Add 198 tenths and 125 tenths to get 323 tenths.

  11. 11. 13.1 + 10.0 = ____

    23.1

    Add 131 tenths and 100 tenths to get 231 tenths.

  12. 12. 3.2 + 1.4 = ____

    4.6

    Add 32 tenths and 14 tenths to get 46 tenths.

12 questions · Seed 104729 · Age guidance, not curriculum certification