Rounding to the Nearest 10 and 100 on Number Lines
Print 3rd grade rounding worksheets: place numbers on a number line and round to the nearest 10 or 100, including halfway numbers. 12 versions with keys.
Worksheet version 1 of 12. The answer key matches the current version.
Mark each number with a dot on its number line. Is it closer to the left end or the right end? Write that number. A number exactly halfway rounds up.
1. Round to the nearest 10.
a) Mark 75. Round it to the nearest 10: ________
b) Mark 32. Round it to the nearest 10: ________
c) Mark 693. Round it to the nearest 10: ________
d) Mark 716. Round it to the nearest 10: ________
2. Round to the nearest 100.
a) Mark 782. Round it to the nearest 100: ________
b) Mark 732. Round it to the nearest 100: ________
c) Mark 764. Round it to the nearest 100: ________
d) Mark 450. Round it to the nearest 100: ________
3. Circle every number that rounds to 570 when you round to the nearest 10.
- 575
- 574
- 572
- 565
- 561
- 564
4. Circle every number that rounds to 700 when you round to the nearest 100.
- 649
- 650
- 750
- 638
- 749
- 734
About this worksheet
Rounding means finding the nearest ten or hundred. A number line makes it easy to see: 47 sits between 40 and 50, past the halfway mark of 45, so it is closer to 50. A number that sits exactly on the halfway mark, like 45 or 350, rounds up by the usual rule.
Each version has four numbers to round to the nearest 10 (two two-digit and two three-digit numbers) and four three-digit numbers to round to the nearest 100. Every number line shows its two ends and the halfway mark, and each section has one number exactly halfway, so students practice the rule instead of guessing. The last two questions turn rounding around: circle the numbers that round to a given ten or hundred. The answer key marks each number on its line.
Practice aligned to CCSS 3.NBT.A.1.
Before this: three-digit place value. More practice: addition and subtraction worksheets and 3rd grade math worksheets.
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