What is the estimate to 64.59?

Answer 1

The front end estimate is 60. But estimating a single number, in isolation and without context is a complete waste of time. If I had to add 64.59 to 1 trillion, I would estimate it as 0. If I had to add 64.59 to 0.0000000001, I might use the number as given - not an estimate.
Also, if I had to divide by 13, for example, I would estimate it as 65 since 65/13 = 5.If I had to divide by 16, I would use 64 because 64/16 = 4.

Answer 2

To the nearest integer, 65