Answer :
By adding (81.7-23.456)+(78.44+2.72), we get 139.404
How does one determine the number of significant figures?
Use the three rules below to calculate the number of significant figures in a number:
Non-zero digits are always meaningful.
Any zero between the first and second significant digits is significant.
Only the last zero or trailing zeros in the decimal section are important.
Numbers Have Rules INCLUDING a Decimal Point
START COUNTING FOR SIGNIFICANT FIGURES. On the very first non-zero digit.
STOP COUNTING FOR SIGNIFICANT FIGURES.
Non-zero numbers are ALWAYS meaningful.
After the first non-zero digit, any zero is still relevant. The zeroes preceding the first non-zero digit are unimportant.
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