How many significant figures are there in each

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The non-place-holding digits in a reported measurement are called significant figures.

 We apply general rules of significant figures.

     *     All nonzero digits are significant figures

     *     Interior zero i.e zero between two numbers are significant

     *     Trailing zero i.e zero after a decimal point are significant

     *     Leading zero i.e zero to the left of the first nonzero number is not significant. They only serve to locate the decimal point .

     *     Zero at the end of a number but before a decimal point is ambiguous and should be avoided by using scientific notation.