Cardinal Math

Grade 3 · 3.NBT.1 · sheet 14 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 222 to the nearest ten
  2. 2 Round 346 to the nearest hundred
  3. 3 Round 362 to the nearest ten
  4. 4 Round 216 to the nearest hundred
  5. 5 Round 650 to the nearest hundred
  6. 6 Round 615 to the nearest hundred
  7. 7 Round 403 to the nearest ten
  8. 8 Round 728 to the nearest hundred
  9. 9 Round 181 to the nearest ten
  10. 10 Round 750 to the nearest hundred
  11. 11 Round 524 to the nearest ten
  12. 12 Round 774 to the nearest ten
  13. 13 Round 355 to the nearest ten
  14. 14 Round 835 to the nearest ten
  15. 15 Round 870 to the nearest hundred
  16. 16 Round 345 to the nearest ten
  17. 17 Round 850 to the nearest hundred
  18. 18 Round 430 to the nearest hundred
  19. 19 Round 835 to the nearest hundred
  20. 20 Round 243 to the nearest ten
Cardinal Math · sheet 14 key: cardinalmath.com/worksheets/rounding/14/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 (8 problems), cutting the number off instead of rounding (7 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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