🔢 Mathematics · Number Representation & Place Value
10 More or 10 Less
Mentally find 10 more or 10 less than a given two-digit number without counting
Typical age: 6–7 years
“Can your child quickly tell you what is 10 more than 43 or 10 less than 71 — without counting up or down one at a time?”
0 / 3 mastered
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- Generalising Patterns
Mentally finding 10 more/less uses generalised repeated reasoning about place value
- Adding and subtracting tens mentallyREQUIRED
Adding/subtracting tens builds on mentally finding 10 more or less
- 10 or 100 More or LessREQUIRED
Finding 10/100 more/less within 1000 extends finding 10 more/less of two-digit numbers