Cardinal Math

Grade 3 · 3.NBT.1 · sheet 5 of 30

Rounding to the nearest ten and hundred

A printable worksheet, new every day, with a key that names the mistake.

  • Ten numbers to round to the nearest ten and ten to the nearest hundred, three of each sitting exactly halfway.
  • The key names the two usual mistakes: cutting the number off instead of rounding, and looking at the wrong digit.
Answer key Another sheet →

Rounding to the nearest ten and hundred

Round each number. Halfway rounds up.

Name Date
  1. 1 Round 615 to the nearest hundred
  2. 2 Round 287 to the nearest ten
  3. 3 Round 413 to the nearest hundred
  4. 4 Round 513 to the nearest hundred
  5. 5 Round 41 to the nearest ten
  6. 6 Round 713 to the nearest ten
  7. 7 Round 195 to the nearest ten
  8. 8 Round 729 to the nearest hundred
  9. 9 Round 275 to the nearest ten
  10. 10 Round 64 to the nearest ten
  11. 11 Round 276 to the nearest hundred
  12. 12 Round 391 to the nearest ten
  13. 13 Round 703 to the nearest hundred
  14. 14 Round 104 to the nearest hundred
  15. 15 Round 350 to the nearest hundred
  16. 16 Round 819 to the nearest ten
  17. 17 Round 850 to the nearest hundred
  18. 18 Round 450 to the nearest hundred
  19. 19 Round 574 to the nearest ten
  20. 20 Round 845 to the nearest ten
Cardinal Math · sheet 5 key: cardinalmath.com/worksheets/rounding/5/key/

The app does this live.

It picks the next problem from the last answer, skips ahead or doubles back, and animates the teaching instead of handing over a rule. Inside the app the same patterns the key names are caught as your child plays.

How to use the key

Mark the sheet against the key. Beside each answer it lists what the known mistakes would have written. One wrong answer is a slip. The same pattern three times is a rule your child is following, and the guide says what to do about it tonight.

On this sheet the key can tell apart: rounding at the wrong place (12 problems), cutting the number off instead of rounding (9 problems).

Cardinal Math watches for all of these, every day.

Inside the app the same patterns are caught as your child plays, across the whole of K to grade 5, and explained to you in plain words. One price, no ads, no streaks. Coming to iPhone and iPad.

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