45000
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At least 3, possibly 5. Integers ending in 0 are ambiguous. It is possible that 300 is accurate to the nearest hundred (1 sig fig) or accurate to the nearest unit (3 sig fig): there is no way to tell.
3 significant figures.
There are 4 significant figures in this number.
There are 3 significant figures in this number.
There are 2 significant figures in this number.
There are 3 significant figures in this number.