The Math Meridian
Back to Grade 4

Estimate sums and differences

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Learn it Round each number to a friendly place value, then calculate. Estimates help you check if an exact answer makes sense.

Example: Estimate $5{,}812 - 2{,}391$ to the nearest 100.

  1. 5,812 → 5,800.
  2. 2,391 → 2,400.
  3. $5{,}800 - 2{,}400 = 3{,}400$. The answer is about 3,400.

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