10 or 100 More or Less: Crossing a Hundred
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10 or 100 More or Less: Crossing a Hundred
Mental math worksheet for Grade 2: twenty problems that add or take away 10 or 100 from three-digit numbers, half crossing a hundred, such as 395 + 10 and 402 − 10. With an answer key.
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Teach it first
10 or 100 More or LessA teaching handout to hand out before this sheet: the rule, worked examples and common mistakes.- Pages
- 1
- Last updated
- Time
- About 10 minutes
- Answer key
- Included
- Printing
- Black and white
- Related curriculum
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Find 10 more and 10 less than a two-digit number, and 10 or 100 more or less than a three-digit number, without counting; add and take away tens, and add tens or ones to a two-digit number.
Reviewed by Ms. Olivia Parker, Teacher. How we check worksheets
How to use this sheet
- Use a hundred chart beside the sheet: 10 more is one square down, 10 less is one square up.
- Before writing, ask which digit will change when you add 10. Only the tens digit changes.
- Have the child read the answer aloud to check it sounds right: 47, 57, 67.
Common mistakes
- Changing the ones digit too, so 10 more than 47 becomes 58. Cover the ones digit: it stays the same.
- Counting on 10 ones one by one instead of jumping a ten. Count by tens from the number instead: 47, 57.
- Getting stuck at a new hundred, such as 10 more than 95. Use the chart or blocks: ten tens make a hundred.
