What points to be considered during addition.

Explanation

In addition and subtraction of significant numbers following points should be followed.
If significant figures are whole numbers then they should be added or subtracted by normal rules of addition and subtraction.
For example
A = 25 g, B = 2g then
A + B = 25 + 2 = 27 g
A - B = 25 - 2 = 23g
In addition or subtraction, the final result should retain as many decimal places as there in number with the least decimal places.
For example, 436.32 g, 227.2 g and 0.301 g is to be added
`:.43632g `
`+227.2 g`
`(+0.301)/(663.821)=(g)/(g)`
In number 227.2 there is only one digit after decimal point hence result also should have one digit after decimal point.
Hence, 663,821 should be rounded off to 663.8
For example difference of 0.307 m and 0.304 m is to be obtained,
`:. 0.307m`
`(-0.304m)/(0.003m)`
This should be written as `3.00 xx 10^(-3) m`.
It can not be written as `3.00 xx 10^(-3)`
.In addition or subtraction rule of decimal point should be followed.