It is impossible to tell how many significant figures are in a large number with zeros to the left of the decimal point without converting the number to scientific notation
To find the number of significant figures in a given number:
for a number written in scientific notation count only the digits in the coefficient
When adding or subtracting numbers, the number of digits to the right of the decimal point in the result should be the same as the number of digits to the right of the decimal point in the number with the fewest digits to the right of the decimal point
You will find worked examples at: http://
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