Because they show how big a number is, for example you cant just write '3' and say its three million, you need zeros to show how big it really is, i.e. 3,000,000.
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Because
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.
Yes - zeros in-between significant digits are significant.
No.