Notes on Significant Figures By Wee Nee!!

(1) All nonzero digits are significant:
1.234 has 4 significant figures,1.2 has 2 significant figures.

(2) Zeroes between nonzero digits are significant:
1002 has 4 significant figures,3.07 has 3 significant figures.

(3) Leading zeros to the left of the first nonzero digits are not significant; such zeroes merely indicate the position of the decimal point:
0.001 has only 1 significant figure,0.012 has 2 significant figures.

(4) Trailing zeroes that are also to the right of a decimal point in a number are significant:
0.0230 has 3 significant figures,0.20 has 2 significant figures.

(5) When a number ends in zeroes that are not to the right of a decimal point, the zeroes are not necessarily significant:
190 may be 2 or 3 significant figures,50,600 may be 3, 4, or 5 significant figures.
For example, depending on whether the number of significant figures is 3, 4, or 5, we would write 50,600 as:
5.06 (3 significant figures)5.060 (4 significant figures), or5.0600 (5 significant figures).

Good Job Wee Nee! I like point no. (4) in particular.

Anyone else to provide us valuable notes on other chapters??