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Mathematics - Quick Way to Add or Subtract 2 or 3 Digit Numbers
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Quick Way to Add or Subtract 2 or 3 Digit Numbers

Mathematics

To add numbers that aren’t a multiple of ten or one-hundred, round the number to the nearest tens or hundreds digit, add, then add or subtract by the number you rounded off. Do the opposite when subtracting. Example: 144 + 48 = 144 + 50 – 2 = 192

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