How many significant figures are in 0.04050?

1 Answer
Oct 1, 2017

Answer:

#4#.

Explanation:

There are #2# (well, perhaps #2.5#) laws of significant figures present here.

The first one being that all non-zero numbers are significant. With a #4# and a #5# in the number, we know there are at least #2# significant digits.

The second being that a zero in between non-zero numbers are significant. This adds the significant digit count to #3#.

Lastly (kind of), is that a trailing zero after a decimal is significant. So the #405color(red)(0)# is significant. The two other zeros in front of the decimal are irrelevant.

Therefore, there are #4# significant digits in this number.

I hope that helps!