Significant figures rules
All nonzero digits are significant.
Zeros between nonzero digits are significant.
Left-end zeros are never significant.
Right-end zeros are significant if there's a decimal point.
4.050 = This number has four significant figures. Zeros are significant because there's a decimal point.
6.00 = Three significant figures. There's a decimal point, so zeros are significant.
0.04 = One significant figure. Two left-end zeros and one nonzero digit.
0.01103 = Four significant figures. Three nonzero digits, one zero between nonzero digits.
5020.0 = Five significant figures. There are two right-end significant zeros because of the decimal point.
0.060 = Two significant figures. One nonzero digit and one right-end zero. There's a decimal point.
0.550 = Three significant figures. Two nonzero digits and one right-end zero. There's a decimal point.