MathematicsAddition & SubtractionAges 7–8
Mental addition and subtraction (age 7+)
Mentally add and subtract a three-digit number and ones
Teaching approaches
Gakuva’s recommended starting approach is selected. You can still compare every option.
1 approach
Selected Default Gakuva
Can your child work out '436 + 7' or '521 − 8' in their head — keeping the hundreds and tens unchanged while adjusting just the ones?
Mentally add and subtract a three-digit number and ones
Learning resources
Reviewed external links that reinforce this concept. They do not replace Gakuva’s teaching approach.
No reviewed resources for this concept yet.
The teaching approach above still stands. Curated practice links — and later lock-ranked options — will appear here as the shelf fills.
Explore the learning path
2 before · 1 after
Loading map…
Before
This concept
Mental addition and subtraction (age 7+)Procedural concept
Check understanding
- Calculate 345 + 7 mentally
- Calculate 462 − 5 mentally
- Explain that only the ones digit changes (unless bridging through a ten)
“Can your child work out '436 + 7' or '521 − 8' in their head — keeping the hundreds and tens unchanged while adjusting just the ones?”
Curriculum record
- Type
- Procedural
- Subject
- Mathematics
- Domain
- Addition & Subtraction
- Age range
- Ages 7–8
Standards
uk-nc-2013:Ma/KS2/Y3/AS/1a