Numihana611 + 20 = — use a mental method.
Answer: ________________
LEARN, PRINT & PRACTISE
Mental addition of tens.
Mental addition of tens
Numihana · England Year 3
Mental addition of tens
Practice sheet
Name: ______________
Date: ______________
Mental addition of tens
910 + 70 = — use a mental method.
Answer: ________________
25 + 60 = — use a mental method.
Answer: ________________
236 + 90 = — use a mental method.
Answer: ________________
613 + 60 = — use a mental method.
Answer: ________________
417 + 30 = — use a mental method.
Answer: ________________
Numihana · England Year 3
Mental addition of tens
Answer key
Name: ______________
Date: ______________
Mental addition of tens
611 + 20 = — use a mental method.
Answer: 631
910 + 70 = — use a mental method.
Answer: 980
25 + 60 = — use a mental method.
Answer: 85
236 + 90 = — use a mental method.
Answer: 326
613 + 60 = — use a mental method.
Answer: 673
417 + 30 = — use a mental method.
Answer: 447
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The skill behind this activity
Mental addition of tens
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
594 + 0 = — use a mental method.
Answer: 594
Change the requested ones, tens or hundreds place. Partition or count on/back, then undo the change to check.