Numihana72 + 400 = — use a mental method.
Answer: ________________
LEARN, PRINT & PRACTISE
Mental addition of hundreds.
Mental addition of hundreds
Numihana · England Year 3
Mental addition of hundreds
Practice sheet
Name: ______________
Date: ______________
Mental addition of hundreds
312 + 200 = — use a mental method.
Answer: ________________
572 + 0 = — use a mental method.
Answer: ________________
64 + 400 = — use a mental method.
Answer: ________________
242 + 200 = — use a mental method.
Answer: ________________
467 + 500 = — use a mental method.
Answer: ________________
Numihana · England Year 3
Mental addition of hundreds
Answer key
Name: ______________
Date: ______________
Mental addition of hundreds
72 + 400 = — use a mental method.
Answer: 472
312 + 200 = — use a mental method.
Answer: 512
572 + 0 = — use a mental method.
Answer: 572
64 + 400 = — use a mental method.
Answer: 464
242 + 200 = — use a mental method.
Answer: 442
467 + 500 = — use a mental method.
Answer: 967
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The skill behind this activity
Mental addition of hundreds
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
74 + 900 = — use a mental method.
Answer: 974
Change the requested ones, tens or hundreds place. Partition or count on/back, then undo the change to check.