Question

How can we find underoot 90 by estimation

Answer 1

root 90=9.5.
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Answer 2

One way is to find the nearest perfect cube numbers

For 90, 64 and 125 are the nearest . 90 is almost mid way (maybe a little closer )between 64 and 125 so its cube root is almost midway between 4 and 5

so it might be around 4.5

and the exact value is 4.48 so its close enough