All non zero digits are significant. … Trailing zeros (the right most zeros) are significant when there is a decimal point in the number. For this reason it is important to give consideration to when a decimal point is used and to keep the trailing zeros to indicate the actual number of significant figures.

Are trailing zeros after a decimal point significant?

The terminal or trailing zeros in a number with a decimal point are significant. Example : In 23.60 m, the terminal zero has significance, so the number of significant figures in this number is four (2, 3, 6 and 0).

How many significant figures does 0.001 have?

The first significant figure is the first non-zero value. Example: 0.001, 1 is the significant figure, hence 0.001 has one significant figure. Trailing zeros before the decimal point do not count. Example: 10, 100, 1000 all have only one significant figure.