Question

State the following significant figures of the following numbers
40​

Answer 1

The number of significant figures of 40 is 1

Answer 2

3

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.