Numihana+ 7 = 12
Answer: ________________
LEARN, PRINT & PRACTISE
Use inverse operations.
Find a missing addend and check by substitution.
Numihana · England Year 1
Use inverse operations
Practice sheet
Name: ______________
Date: ______________
Find a missing addend and check by substitution.
+ 2 = 8
Answer: ________________
+ 9 = 16
Answer: ________________
+ 1 = 5
Answer: ________________
+ 6 = 11
Answer: ________________
+ 2 = 6
Answer: ________________
Numihana · England Year 1
Use inverse operations
Answer key
Name: ______________
Date: ______________
Find a missing addend and check by substitution.
+ 7 = 12
Answer: 5
+ 2 = 8
Answer: 6
+ 9 = 16
Answer: 7
+ 1 = 5
Answer: 4
+ 6 = 11
Answer: 5
+ 2 = 6
Answer: 4
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The skill behind this activity
Find a missing addend and check by substitution.
Department for Education: mathematics programmes of study ↗
Year 1 → Number → Addition and subtraction · Selected statutory skill. Pack 2.2.0 · source checked 2026-10-12.
For teachers and parents
Both sides of the equals sign have the same value. Undo the known addition with subtraction, or undo multiplication with division. Substitute the missing value to check.
A common slip
Use the inverse operation; repeating the original operation generally does not find the missing input.
Worked example
+ 9 = 13
Answer: 4
Both sides of the equals sign have the same value. Undo the known addition with subtraction, or undo multiplication with division. Substitute the missing value to check.