State the rules for finding the significant figures in the addition and subtraction of two numbers, with example.

Explanation

Addition and sub traction: The final result should retain as many decimal places as there are in the number with the smallest number with the smallest number of decimal places in addition and subtraction.
Eg:
(i) `4.1+1.780+3.046=8.926`
Here the least number of significant digits after the decimal is one. Hence the result wil be 8.9.
(ii) `14.637 - 4.52 =10.117`
Here the least number of significant digits after the decimal is two. Hence the result will be 10.12