100 has one, 150 has 2, 250 has 2.
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That depends on whether the dot before the question mark is a period or a decimal point. 100 has one significant figure. 100. has three significant figures.
There are 5 significant figures in this number.
1 of them.
There is just one significant figure.
One. 1m = 100cm, and 100 has one significant figure.