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Grade 3 · unit review

Review: Round and Calculate with Place Value

Round to tens and hundreds, compute within 1000, and multiply tens.

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Unit review questions
1. Round 287 to the nearest ten using the halfway-up convention.
Need a hint?
  • Identify both neighboring tens, not only the smaller one.
  • A rounded number is approximate; it does not change the original exact count.
2. Round 568 to the nearest hundred, with midpoints upward.
Need a hint?
  • Read which place the prompt requests.
  • An answer to hundred rounding must be a full multiple of one hundred.
3. Find the exact difference 693−280.
Need a hint?
  • Use an inverse operation for an exact check.
  • A plausible estimate does not prove every digit of an exact answer.
4. Find 7×40.
Need a hint?
  • Name the multiple of ten as a tens count first.
  • Forty-two tens is 420, not 42.

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Use the skills in a new task

Round 347 to a ten and a hundred, then calculate 347+286 exactly and compare with an estimate.

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Compare with a model response

347 rounds to 350 by tens and 300 by hundreds. The exact sum is 633. A hundred estimate is 300+300=600, close enough to check scale rather than replace the exact result.

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