3
The numbers 1, 2, 3, 4, 5, 6, 7, 8, and 9 are always significant. The number 0 is significant only if it is between two of those numbers, or if it at the end of a number with a decimal.
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How many significant figures are in 20.8
3 significant figures.
4 significant figures.
3 significant figures.
Five significant figures.