Compatible Numbers Calculator

Your details

Choose the arithmetic operation you want to estimate.
The first number in your calculation.
The second number in your calculation. For division this is the divisor.
Auto picks the step that suits the magnitude of your numbers. Choose a fixed step for a specific rounding level.
Compatible aExcellent estimate
460

First number rounded to a compatible value

Compatible b670
Estimated result1,130
Exact result1,131
Estimation error0.09%
Absolute error1
0.09% %
Excellent (0-2%)<2%Good (2-5%)2%-5%Fair (5-10%)5%-10%Rough (>10%)10%+

Compatible estimate: 460 + 670 = 1130

  • Round 458 to 460 and 673 to 670 to get 460 + 670 = 1130.
  • The exact answer is 1131, so the estimate is off by 0.09% (1).

Next stepUse this estimate for quick checks. When precision matters, compute the exact answer by hand or with a full calculator.

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