10 More or 10 Less
Mathematics · Number Representation & Place Value · procedural
Mentally find 10 more or 10 less than a given two-digit number without counting
What mastery looks like
- 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
Check your understanding
Can 10 More or 10 Less quickly tell you what is 10 more than 43 or 10 less than 71 — without counting up or down one at a time?
Prerequisites
Required first
Helpful