There are some situations when an analytical solution is not possible and the only option is estimation.
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Use estimation when an approximate answer is acceptable.
In mathematics, division by zero has an "undefined" result.
Because they have been led to believe that it is acceptable, or even cool, to be afraid of mathematics.
If an estimation, or estimate, is a guess, an approximate estimation is a rougher guess.
Estimation is a quick of working out roughly what the answer is