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5. Count the number of digits from the first non-zero digit to the last non-zero digit.
1,2,3,4,5,6,7,8,9
In this case, where there are no non-zero digits to the left of the decimal point, the number of significant figures is equal to the number of digits to the right of the decimal point from the rightmost figure to leftmost non-zero digit. In this case, there are four significant digits
Five significant digits. Remember that all non-zero digits are significant, and all zeros in-between significant digits are significant.
One fewer than the base for the number system.