Rounding to the Nearest 100 on a Number Line
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Rounding to the Nearest 100 on a Number Line
Rounding to the nearest 100 on a number line: eight three-digit numbers, each marked on a line from one hundred to the next, with 50 in the middle. Write the closer hundred. Grade 3, with an answer key.
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Teach it first
Rounding to the Nearest 100A teaching handout to hand out before this sheet: the rule, worked examples and common mistakes.- Pages
- 1
- Last updated
- Time
- About 15 minutes
- Answer key
- Included
- Printing
- Black and white
- Related curriculum
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Round a number to the nearest 10 or 100 by finding the multiples of 10 or 100 it sits between on a number line and seeing which is closer, with a 5 or 50 rounding up.
Reviewed by Ms. Olivia Parker, Teacher. How we check worksheets
How to use this sheet
- For each number, have the child name the two tens or hundreds it is between before rounding.
- Use the number lines on the sheet: mark the number and see which end it is closer to.
- Underline the place you round to and circle the digit to its right. Only the circled digit decides.
Common mistakes
- Rounding 45 down to 40. A 5 rounds up: 45 is rounded to 50.
- Changing every digit after the rounding place to 9, or leaving them as they are. They all become zeros.
- Looking at the wrong digit, such as the ones digit when rounding to the nearest hundred. The digit just right of the rounding place decides.
- Forgetting that rounding up can change more than one digit, as when 296 rounds to 300.
