Numihanax + 4 = 13. Find x.
Answer: ________________
LEARN, PRINT & PRACTISE
Missing-number algebra.
Use an inverse operation to find a missing value in an equation.
Numihana · England Year 6
Missing-number algebra
Practice sheet
Name: ______________
Date: ______________
Use an inverse operation to find a missing value in an equation.
x + 19 = 34. Find x.
Answer: ________________
x + 8 = 31. Find x.
Answer: ________________
x + 28 = 42. Find x.
Answer: ________________
x + 4 = 30. Find x.
Answer: ________________
x + 29 = 38. Find x.
Answer: ________________
Numihana · England Year 6
Missing-number algebra
Answer key
Name: ______________
Date: ______________
Use an inverse operation to find a missing value in an equation.
x + 4 = 13. Find x.
Answer: 9
x + 19 = 34. Find x.
Answer: 15
x + 8 = 31. Find x.
Answer: 23
x + 28 = 42. Find x.
Answer: 14
x + 4 = 30. Find x.
Answer: 26
x + 29 = 38. Find x.
Answer: 9
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The skill behind this activity
Use an inverse operation to find a missing value in an equation.
Department for Education: mathematics programmes of study ↗
Year 6 → Algebra · Selected statutory skill. Pack 2.2.0 · source checked 2026-10-12.
For teachers and parents
The two sides are equal. Use the inverse operation to find the missing value and substitute it back to check.
A common slip
The equals sign means the same value on both sides, not simply “the answer comes next”.
Worked example
x + 26 = 34. Find x.
Answer: 8
The two sides are equal. Use the inverse operation to find the missing value and substitute it back to check.