Numihana14 + = 20
Answer: ________________
LEARN, PRINT & PRACTISE
Number bonds to 20.
Find a missing part of twenty and connect addition with subtraction.
Numihana · England Year 1
Number bonds to 20
Practice sheet
Name: ______________
Date: ______________
Find a missing part of twenty and connect addition with subtraction.
4 + = 20
Answer: ________________
10 + = 20
Answer: ________________
4 + = 20
Answer: ________________
14 + = 20
Answer: ________________
8 + = 20
Answer: ________________
Numihana · England Year 1
Number bonds to 20
Answer key
Name: ______________
Date: ______________
Find a missing part of twenty and connect addition with subtraction.
14 + = 20
Answer: 6
4 + = 20
Answer: 16
10 + = 20
Answer: 10
4 + = 20
Answer: 16
14 + = 20
Answer: 6
8 + = 20
Answer: 12
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The skill behind this activity
Find a missing part of twenty and connect addition with subtraction.
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
Think of the given total as two parts. The visible part and the missing part must combine to make the whole.
A common slip
The missing part is not always the same as the part already shown.
Worked example
15 + = 20
Answer: 5
Think of the given total as two parts. The visible part and the missing part must combine to make the whole.