What is the estimate of the number 1600?

Answer 1

The front end estimate is 2000. But estimating a single number, in isolation and without context, is a complete waste of time. It all comes down to the context of what needs to be done with the number.

If I had to add 1600 to 1 trillion, I would estimate it as 0.
If I had to add 1600 to 0.0000000001, I would use the number as given. If I had to divide it by 30, I would estimate it as 1590, because 1590/30 = 159/3 = 53. If I had to divide it by 33, I would estimate the answer as follows:1600/33 = 1600/(100/3) = 1600*(3/100) = (1600/100)*3 = 16*3 = 48.
[exact answer = 48.4848... ]

Answer 2

To the nearest thousand, 2000