MathematicsAddition & SubtractionAges 7–8
Mentally adding tens to 3-digit numbers
Mentally add and subtract a three-digit number and tens
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 will appear here as the shelf fills.
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This concept
Mentally adding tens to 3-digit numbersProcedural concept
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Check understanding
- Calculate 345 + 40 mentally
- Calculate 462 − 30 mentally
- Explain that only the tens digit changes (unless bridging through a hundred)
“Can your child quickly work out '354 + 40' or '628 − 30' in their head — knowing that only the tens digit changes?”
Curriculum record
- Type
- Procedural
- Subject
- Mathematics
- Domain
- Addition & Subtraction
- Age range
- Ages 7–8
Standards
uk-nc-2013:Ma/KS2/Y3/AS/1b