The number 10.9010 has six significant figures.
If a zero is between two numbers, it is counted as a significant figure.
For example: 101 would have 3 significant digits.
If a zero comes after a decimal point, it is counted as a significant figure.
For example: 1.00 would have 3 significant figures.
In this case, all of the zeroes in the number 10.9010 would count as significant figures and there would be 6 significant figures present.
