The rules of "significant figures" tell you how many of the digits in your answer can
be trusted and how many are trash. Without knowing those rules, you may get an
answer with 15 digits in it, and think that you have the greatest answer there could
be, and not realize that the last 12 digits are wrong and don't mean anything.
There are six significant figures in 1009.630 mL. The zeros that follow the decimal point and are trapped between nonzero digits are considered significant.
To determine the number of significant figures in the product of 0.1400, 6.02, and (10^{23}), we need to identify the significant figures in each number. The number 0.1400 has four significant figures, 6.02 has three significant figures, and (10^{23}) has one significant figure (as it is a power of ten). The product will have the same number of significant figures as the term with the least significant figures, which is 6.02 with three significant figures. Therefore, the final product will have three significant figures.
When multiplying, the number of significant numbers in the answer should be the same as the fewest significant figures in the problem. Both 13.5 and 3.00 have three significant figures, so the answer will have three significant figures. 13.5 x 3.00 = 40.5 exactly (no need to round).
The number 0.600 has three significant figures. All non-zero numbers are always significant. Leading zeroes are never significant, and trailing zeroes that follow a decimal point are always significant.
4 significant figures.
There are 4 significant figures in 0.0032. Seems to be only 2 significant figures in this number.
There are 3 significant figures in 94.2.
3 significant figures.
4 significant figures.
5 significant figures.
4 significant figures.
3 significant figures.