Question

The number 40 has how many significant figures?

Answer 1

`1`

Explanation:

It has one because the `4` is the significant digit and the `0` doesn't count. However, if you had `40.0`, you would have three, because the `0` after the decimal point and the `4` count and the numbers between the significant digits also count.

Answer 2

There is only `1` significant figure in the number `40.`

Explanation:

Since there is no decimal point in the number, the trailing zero is not significant. Therefore the number `40` has only `1` significant figure.