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Missing addends

Find a missing addend using the known part and total.

Practice + answer key · 2 pages

Worksheet settings12 questions · 2 columns · A4
Addend range

The known and missing addends use these bounds. The displayed total is their sum.

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mathsprig-1
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da87f29c
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1 page
Missing addendsMissing addends. Practice. Find the missing addend: 19 + □ = 31. Find the missing addend: 7 + □ = 9. Find the missing addend: 37 + □ = 64. Find the missing addend: 4 + □ = 50. Find the missing addend: 44 + □ = 92. Find the missing addend: 14 + □ = 40. Find the missing addend: 3 + □ = 21. Find the missing addend: 19 + □ = 68. Find the missing addend: 46 + □ = 63. Find the missing addend: 17 + □ = 39. Find the missing addend: 44 + □ = 90. Find the missing addend: 39 + □ = 76.Name __________________________Date _______________Missing addendsWrite the number that makes each addition true.Worked exampleFind the missing addend: 28 + □ = 63. → 35Subtract the known part: 63 − 28 = 35.1.Find the missing addend: 19 + □ =31.2.Find the missing addend: 7 + □ =9.3.Find the missing addend: 37 + □ =64.4.Find the missing addend: 4 + □ =50.5.Find the missing addend: 44 + □ =92.6.Find the missing addend: 14 + □ =40.7.Find the missing addend: 3 + □ =21.8.Find the missing addend: 19 + □ =68.9.Find the missing addend: 46 + □ =63.10.Find the missing addend: 17 + □ =39.11.Find the missing addend: 44 + □ =90.12.Find the missing addend: 39 + □ =76.MathSprig · mathsprig.site · support@mathsprig.sitePage 1 of 1mathsprig-1 · mathsprig-v1 · da87f29c
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Practice + answer key · 2 pages

Arithmetic

What you’ll practice

Use subtraction as the inverse of addition to find a missing addend.

You know the total and one of its parts. Subtract that part to find the missing addend, then put your answer back into the addition to check it.

How this skill works

The total consists of the known addend plus the missing addend. Subtract the known amount from the total to isolate the missing amount.

After filling the box, read the complete addition again. It must give exactly the total stated in the question.

Worked example

Find the missing addend: 28 + □ = 63.
  1. Subtract the known part: 63 − 28 = 35.
  2. Check: 28 + 35 = 63.

Answer: 35

Teaching notes

  • Treat the box as a number, not as an operation.
  • A zero answer is possible if the known addend already equals the total.
Practice questions
  1. Find the missing addend: 19 + □ = 31.
  2. Find the missing addend: 7 + □ = 9.
  3. Find the missing addend: 37 + □ = 64.
  4. Find the missing addend: 4 + □ = 50.
  5. Find the missing addend: 44 + □ = 92.
  6. Find the missing addend: 14 + □ = 40.
  7. Find the missing addend: 3 + □ = 21.
  8. Find the missing addend: 19 + □ = 68.
  9. Find the missing addend: 46 + □ = 63.
  10. Find the missing addend: 17 + □ = 39.
  11. Find the missing addend: 44 + □ = 90.
  12. Find the missing addend: 39 + □ = 76.
Answers and steps
  1. 12
    1. Subtract the known part from the total: 31 − 19 = 12.
    2. Check by adding: 19 + 12 = 31.
  2. 2
    1. Subtract the known part from the total: 9 − 7 = 2.
    2. Check by adding: 7 + 2 = 9.
  3. 27
    1. Subtract the known part from the total: 64 − 37 = 27.
    2. Check by adding: 37 + 27 = 64.
  4. 46
    1. Subtract the known part from the total: 50 − 4 = 46.
    2. Check by adding: 4 + 46 = 50.
  5. 48
    1. Subtract the known part from the total: 92 − 44 = 48.
    2. Check by adding: 44 + 48 = 92.
  6. 26
    1. Subtract the known part from the total: 40 − 14 = 26.
    2. Check by adding: 14 + 26 = 40.
  7. 18
    1. Subtract the known part from the total: 21 − 3 = 18.
    2. Check by adding: 3 + 18 = 21.
  8. 49
    1. Subtract the known part from the total: 68 − 19 = 49.
    2. Check by adding: 19 + 49 = 68.
  9. 17
    1. Subtract the known part from the total: 63 − 46 = 17.
    2. Check by adding: 46 + 17 = 63.
  10. 22
    1. Subtract the known part from the total: 39 − 17 = 22.
    2. Check by adding: 17 + 22 = 39.
  11. 46
    1. Subtract the known part from the total: 90 − 44 = 46.
    2. Check by adding: 44 + 46 = 90.
  12. 37
    1. Subtract the known part from the total: 76 − 39 = 37.
    2. Check by adding: 39 + 37 = 76.