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three, leading zeros are not significant and trailing zeros are significant if there is a decimal. trailing zeros are not significant if there is no decimal zeros in the middle of numbers are significant
242 zeros.
Trailing zeros after a decimal point are not normally written. As trailing zeros have been written they must be significant; thus 220.0 has 5 sig fig.
Two - the trailing zeros are not significant.
The square root is 35.44, but that has more numbers trailing.