Mental addition and subtraction (age 7+)
Mathematics · Addition & Subtraction · procedural
Mentally add and subtract a three-digit number and ones
What mastery looks like
- Calculate 345 + 7 mentally
- Calculate 462 − 5 mentally
- Explain that only the ones digit changes (unless bridging through a ten)
Check your understanding
Can Mental addition and subtraction (age 7+) work out '436 + 7' or '521 − 8' in their head — keeping the hundreds and tens unchanged while adjusting just the ones?
Prerequisites
Required first
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