How many significant figures are in the result of (2.325-2.32) ?
#Rules for counting significant figures for Numbers WITH a Decimal Point:
1. START counting for sig. figs. On the FIRST non-zero digit.
2. STOP counting for sig. figs. On the VERY LAST digit (regardless whether or not the last digit is a zero or non-zero number).
3. Non-zero digits are ALWAYS significant.
4. Any zero AFTER the first non-zero digit is STILL significant. The zeroes BEFORE the first non-zero digit are insignificant.
In this case, The result of (2.325 – 2.32) is 0.005
Hence, number of significant figure is 1. Because the zeros before 5 are not to be considered.