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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. 4.7 + 11.4 = ____

    4.7 · 11.4 · Decimal addition

  2. 2. 15.0 + 10.3 = ____

    15.0 · 10.3 · Decimal addition

  3. 3. 1.2 + 13.1 = ____

    1.2 · 13.1 · Decimal addition

  4. 4. 13.4 + 5.9 = ____

    13.4 · 5.9 · Decimal addition

  5. 5. 8.1 + 10.9 = ____

    8.1 · 10.9 · Decimal addition

  6. 6. 2.2 + 9.3 = ____

    2.2 · 9.3 · Decimal addition

  7. 7. 9.5 + 16.6 = ____

    9.5 · 16.6 · Decimal addition

  8. 8. 19.4 + 4.7 = ____

    19.4 · 4.7 · Decimal addition

  9. 9. 19.3 + 13.7 = ____

    19.3 · 13.7 · Decimal addition

  10. 10. 12.1 + 4.7 = ____

    12.1 · 4.7 · Decimal addition

  11. 11. 13.7 + 1.7 = ____

    13.7 · 1.7 · Decimal addition

  12. 12. 6.6 + 14.5 = ____

    6.6 · 14.5 · Decimal addition
12 questions · Seed 45 · 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. 4.7 + 11.4 = ____

    16.1

    Add 47 tenths and 114 tenths to get 161 tenths.

  2. 2. 15.0 + 10.3 = ____

    25.3

    Add 150 tenths and 103 tenths to get 253 tenths.

  3. 3. 1.2 + 13.1 = ____

    14.3

    Add 12 tenths and 131 tenths to get 143 tenths.

  4. 4. 13.4 + 5.9 = ____

    19.3

    Add 134 tenths and 59 tenths to get 193 tenths.

  5. 5. 8.1 + 10.9 = ____

    19.0

    Add 81 tenths and 109 tenths to get 190 tenths.

  6. 6. 2.2 + 9.3 = ____

    11.5

    Add 22 tenths and 93 tenths to get 115 tenths.

  7. 7. 9.5 + 16.6 = ____

    26.1

    Add 95 tenths and 166 tenths to get 261 tenths.

  8. 8. 19.4 + 4.7 = ____

    24.1

    Add 194 tenths and 47 tenths to get 241 tenths.

  9. 9. 19.3 + 13.7 = ____

    33.0

    Add 193 tenths and 137 tenths to get 330 tenths.

  10. 10. 12.1 + 4.7 = ____

    16.8

    Add 121 tenths and 47 tenths to get 168 tenths.

  11. 11. 13.7 + 1.7 = ____

    15.4

    Add 137 tenths and 17 tenths to get 154 tenths.

  12. 12. 6.6 + 14.5 = ____

    21.1

    Add 66 tenths and 145 tenths to get 211 tenths.

12 questions · Seed 45 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 10-12

Decimal addition

Take your time. Show your thinking.

  1. 1. 4.7 + 11.4 = ____

    4.7 · 11.4 · Decimal addition

  2. 2. 15.0 + 10.3 = ____

    15.0 · 10.3 · Decimal addition

  3. 3. 1.2 + 13.1 = ____

    1.2 · 13.1 · Decimal addition

  4. 4. 13.4 + 5.9 = ____

    13.4 · 5.9 · Decimal addition

  5. 5. 8.1 + 10.9 = ____

    8.1 · 10.9 · Decimal addition

  6. 6. 2.2 + 9.3 = ____

    2.2 · 9.3 · Decimal addition

  7. 7. 9.5 + 16.6 = ____

    9.5 · 16.6 · Decimal addition

  8. 8. 19.4 + 4.7 = ____

    19.4 · 4.7 · Decimal addition

  9. 9. 19.3 + 13.7 = ____

    19.3 · 13.7 · Decimal addition

  10. 10. 12.1 + 4.7 = ____

    12.1 · 4.7 · Decimal addition

  11. 11. 13.7 + 1.7 = ____

    13.7 · 1.7 · Decimal addition

  12. 12. 6.6 + 14.5 = ____

    6.6 · 14.5 · Decimal addition
12 questions · Seed 45 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 10-12

Decimal addition

Answers and reasoning. Review before teaching.

  1. 1. 4.7 + 11.4 = ____

    16.1

    Add 47 tenths and 114 tenths to get 161 tenths.

  2. 2. 15.0 + 10.3 = ____

    25.3

    Add 150 tenths and 103 tenths to get 253 tenths.

  3. 3. 1.2 + 13.1 = ____

    14.3

    Add 12 tenths and 131 tenths to get 143 tenths.

  4. 4. 13.4 + 5.9 = ____

    19.3

    Add 134 tenths and 59 tenths to get 193 tenths.

  5. 5. 8.1 + 10.9 = ____

    19.0

    Add 81 tenths and 109 tenths to get 190 tenths.

  6. 6. 2.2 + 9.3 = ____

    11.5

    Add 22 tenths and 93 tenths to get 115 tenths.

  7. 7. 9.5 + 16.6 = ____

    26.1

    Add 95 tenths and 166 tenths to get 261 tenths.

  8. 8. 19.4 + 4.7 = ____

    24.1

    Add 194 tenths and 47 tenths to get 241 tenths.

  9. 9. 19.3 + 13.7 = ____

    33.0

    Add 193 tenths and 137 tenths to get 330 tenths.

  10. 10. 12.1 + 4.7 = ____

    16.8

    Add 121 tenths and 47 tenths to get 168 tenths.

  11. 11. 13.7 + 1.7 = ____

    15.4

    Add 137 tenths and 17 tenths to get 154 tenths.

  12. 12. 6.6 + 14.5 = ____

    21.1

    Add 66 tenths and 145 tenths to get 211 tenths.

12 questions · Seed 45 · Age guidance, not curriculum certification