Numihana824 + 3 = — use a mental method.
Answer: ________________
LEARN, PRINT & PRACTISE
Mental addition of ones.
Mental addition of ones
Numihana · England Year 3
Mental addition of ones
Practice sheet
Name: ______________
Date: ______________
Mental addition of ones
950 + 7 = — use a mental method.
Answer: ________________
729 + 4 = — use a mental method.
Answer: ________________
826 + 5 = — use a mental method.
Answer: ________________
620 + 4 = — use a mental method.
Answer: ________________
394 + 0 = — use a mental method.
Answer: ________________
Numihana · England Year 3
Mental addition of ones
Answer key
Name: ______________
Date: ______________
Mental addition of ones
824 + 3 = — use a mental method.
Answer: 827
950 + 7 = — use a mental method.
Answer: 957
729 + 4 = — use a mental method.
Answer: 733
826 + 5 = — use a mental method.
Answer: 831
620 + 4 = — use a mental method.
Answer: 624
394 + 0 = — use a mental method.
Answer: 394
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The skill behind this activity
Mental addition of ones
Department for Education: mathematics programmes of study ↗
Year 3 → Number → Addition and subtraction · Selected statutory skill. Pack 2.2.0 · source checked 2026-10-12.
For teachers and parents
Change the requested ones, tens or hundreds place. Partition or count on/back, then undo the change to check.
A common slip
Changing tens means changing groups of ten, not ones.
Worked example
340 + 4 = — use a mental method.
Answer: 344
Change the requested ones, tens or hundreds place. Partition or count on/back, then undo the change to check.