How many significant figures in 453.9870?

Answer 1

Three

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Numbers ending in 0s before the decimal point are ambiguous. In this case, for example you cannot tell if the number is rounded to the nearest ten (3 sig figs), or to the nearest unit (4 sig figs).

Answer 2

There are 6 significant figures in 453.9870.

Answer 3

7 of them.

Answer 4

Seven