In 100 million (100*106) are three significants (1, 0 and 0, not in 106).
However in this "100,000,000 people" (as questioned) there are nine significant figures, becausse it is NOT equal to eg. 100,000,002, meaning the last figure (2) gives it a value of two more people!
(But there are still a "100 million (100*106)" people)
Integers ending in 0s are ambiguous cases. The above number can have 1 to 9 significant figures. For example, if you are told that it is accurate to the nearest whole number then it has 9 sig figs.
How many significant figures are in 20.8
There are 3 significant figures in 94.2.
There are four significant figures in 0.1111.
4 significant figures.
5 significant figures.
4 significant figures.
3 significant figures.
3 significant figures.
4 significant figures.
4 significant figures.
How many significant figures are in 13001kg