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We can estimate the answer to an addition sum by rounding the numbers to the nearest hundred before we add.
Example 1
Estimate the answer to the following sum by rounding the numbers to the nearest hundred and then adding.
326 + 567
Answer
326 + 567
↓ ↓
300 + 600 = 900
Example 2
Estimate the answer to the following sum by rounding the numbers to the nearest hundred and then adding.
150 + 415
Answer
150 + 415
↓ ↓
200 + 400 = 600
Remember that 150 rounds up to 200, 350 rounds up to 400, 250 rounds up to 300 etc.
