Oh, dude, let me count... like, there are three significant figures in 105 cm. The zero at the end is just there for decoration, it's not doing anything important. So yeah, three sig figs, but who's really counting anyway?
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To figure out how many significant figures there are in a number you must first know the rules. All numbers 1-9 are counted towards the number of significant figures. The only number you need to worry about is 0.-If there are 0's between digits (like 105), they are counted towards sig figs.-If, to the right of a decimal point, the number ends in a 0, or multiple 0's (4.660), they all count towards sig figs.-If, to the left of a decimal point, the number ends in 0 (4500), the 0 (or this case zeros) do not count towards sig figs.-If there is a lone 0 to the left of a decimal point (0.112), the 0 does not count towards sig figs.With the number 3.0800, you know that the 3 and the 8 both count towards significant figures. The 0 in between them counts as well. Then the two 0's at the end count towards sig figs. In all the number 3.0800 has 5 significant figures.
Count all the digits, from the first to the last non-zero digit. Include any zeros in between in the count. For example, 105 and 10500 both have three significant digits. Also include any zero after the last non-zero digit, only if it comes after a decimal point. Thus, 0.001050 has four significant digits, since you need to count the last zero.
105
105 ÷ 40 = 2.625 or twice with a remainder of 25.
There are many different ways you could divide 105 objects or people into groups. You could have one group of 105, or 2 groups of 52 and a half objects for example.