Because there is quite a significant difference between paying $1.79 for something
and paying $179 for the same thing.
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Zeroes to the left of the decimal point are significant if there is a decimal point present. Zeroes between numbers are always significant. Zeroes to the right of the decimal point are always significant. Non-zero numbers except for the last are always significant. The last non-zero number is always insignificant.
0.50 has two significant figures, the 5 and the trailing 0 after the decimal point. The leading zero before the decimal point is not significant.
That is correct.
Five - zeros after the decimal point that aren't placeholders are significant.
5 As the zeroes are to the right of the decimal point, they too are significant