242 zeros.
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There are 18 zeros.
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
Five. Zeros in between significant digits are significant and trailing zeros that are after the decimal are significant.
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.