10 More or 10 Less
Mentally find 10 more or 10 less than a given two-digit number without counting
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Teaching Table
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“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?”
Full guide and materials
- Activity. Mentally find 10 more or 10 less than a given two-digit number without counting
What to notice. Given 56, quickly say 66 is 10 more and 46 is 10 less • Explain that adding 10 increases the tens digit by 1 • Answer '10 more than 73' without using fingers or counting on
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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?
Mentally find 10 more or 10 less than a given two-digit number without counting
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Check understanding
- Given 56, quickly say 66 is 10 more and 46 is 10 less
- Explain that adding 10 increases the tens digit by 1
- Answer '10 more than 73' without using fingers or counting on
“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?”
Curriculum record
- Type
- Procedural
- Subject
- Mathematics
- Domain
- Number Representation & Place Value
- Age range
- Ages 6–7
Standards