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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. 6.2 + 4.5 = ____

    6.2 · 4.5 · Decimal addition

  2. 2. 12.9 + 13.1 = ____

    12.9 · 13.1 · Decimal addition

  3. 3. 1.5 + 19.4 = ____

    1.5 · 19.4 · Decimal addition

  4. 4. 11.5 + 11.6 = ____

    11.5 · 11.6 · Decimal addition

  5. 5. 2.9 + 3.5 = ____

    2.9 · 3.5 · Decimal addition

  6. 6. 4.5 + 8.6 = ____

    4.5 · 8.6 · Decimal addition

  7. 7. 5.2 + 4.7 = ____

    5.2 · 4.7 · Decimal addition

  8. 8. 11.8 + 13.5 = ____

    11.8 · 13.5 · Decimal addition

  9. 9. 5.0 + 6.3 = ____

    5.0 · 6.3 · Decimal addition

  10. 10. 9.3 + 19.8 = ____

    9.3 · 19.8 · Decimal addition

  11. 11. 16.8 + 13.2 = ____

    16.8 · 13.2 · Decimal addition

  12. 12. 4.2 + 14.7 = ____

    4.2 · 14.7 · Decimal addition
12 questions · Seed 104732 · 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. 6.2 + 4.5 = ____

    10.7

    Add 62 tenths and 45 tenths to get 107 tenths.

  2. 2. 12.9 + 13.1 = ____

    26.0

    Add 129 tenths and 131 tenths to get 260 tenths.

  3. 3. 1.5 + 19.4 = ____

    20.9

    Add 15 tenths and 194 tenths to get 209 tenths.

  4. 4. 11.5 + 11.6 = ____

    23.1

    Add 115 tenths and 116 tenths to get 231 tenths.

  5. 5. 2.9 + 3.5 = ____

    6.4

    Add 29 tenths and 35 tenths to get 64 tenths.

  6. 6. 4.5 + 8.6 = ____

    13.1

    Add 45 tenths and 86 tenths to get 131 tenths.

  7. 7. 5.2 + 4.7 = ____

    9.9

    Add 52 tenths and 47 tenths to get 99 tenths.

  8. 8. 11.8 + 13.5 = ____

    25.3

    Add 118 tenths and 135 tenths to get 253 tenths.

  9. 9. 5.0 + 6.3 = ____

    11.3

    Add 50 tenths and 63 tenths to get 113 tenths.

  10. 10. 9.3 + 19.8 = ____

    29.1

    Add 93 tenths and 198 tenths to get 291 tenths.

  11. 11. 16.8 + 13.2 = ____

    30.0

    Add 168 tenths and 132 tenths to get 300 tenths.

  12. 12. 4.2 + 14.7 = ____

    18.9

    Add 42 tenths and 147 tenths to get 189 tenths.

12 questions · Seed 104732 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 10-12

Decimal addition

Take your time. Show your thinking.

  1. 1. 6.2 + 4.5 = ____

    6.2 · 4.5 · Decimal addition

  2. 2. 12.9 + 13.1 = ____

    12.9 · 13.1 · Decimal addition

  3. 3. 1.5 + 19.4 = ____

    1.5 · 19.4 · Decimal addition

  4. 4. 11.5 + 11.6 = ____

    11.5 · 11.6 · Decimal addition

  5. 5. 2.9 + 3.5 = ____

    2.9 · 3.5 · Decimal addition

  6. 6. 4.5 + 8.6 = ____

    4.5 · 8.6 · Decimal addition

  7. 7. 5.2 + 4.7 = ____

    5.2 · 4.7 · Decimal addition

  8. 8. 11.8 + 13.5 = ____

    11.8 · 13.5 · Decimal addition

  9. 9. 5.0 + 6.3 = ____

    5.0 · 6.3 · Decimal addition

  10. 10. 9.3 + 19.8 = ____

    9.3 · 19.8 · Decimal addition

  11. 11. 16.8 + 13.2 = ____

    16.8 · 13.2 · Decimal addition

  12. 12. 4.2 + 14.7 = ____

    4.2 · 14.7 · Decimal addition
12 questions · Seed 104732 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 10-12

Decimal addition

Answers and reasoning. Review before teaching.

  1. 1. 6.2 + 4.5 = ____

    10.7

    Add 62 tenths and 45 tenths to get 107 tenths.

  2. 2. 12.9 + 13.1 = ____

    26.0

    Add 129 tenths and 131 tenths to get 260 tenths.

  3. 3. 1.5 + 19.4 = ____

    20.9

    Add 15 tenths and 194 tenths to get 209 tenths.

  4. 4. 11.5 + 11.6 = ____

    23.1

    Add 115 tenths and 116 tenths to get 231 tenths.

  5. 5. 2.9 + 3.5 = ____

    6.4

    Add 29 tenths and 35 tenths to get 64 tenths.

  6. 6. 4.5 + 8.6 = ____

    13.1

    Add 45 tenths and 86 tenths to get 131 tenths.

  7. 7. 5.2 + 4.7 = ____

    9.9

    Add 52 tenths and 47 tenths to get 99 tenths.

  8. 8. 11.8 + 13.5 = ____

    25.3

    Add 118 tenths and 135 tenths to get 253 tenths.

  9. 9. 5.0 + 6.3 = ____

    11.3

    Add 50 tenths and 63 tenths to get 113 tenths.

  10. 10. 9.3 + 19.8 = ____

    29.1

    Add 93 tenths and 198 tenths to get 291 tenths.

  11. 11. 16.8 + 13.2 = ____

    30.0

    Add 168 tenths and 132 tenths to get 300 tenths.

  12. 12. 4.2 + 14.7 = ____

    18.9

    Add 42 tenths and 147 tenths to get 189 tenths.

12 questions · Seed 104732 · Age guidance, not curriculum certification