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how we add the sub and add Related: Examples(NCERT): Word Problems fo...
We always add the same sign numbers and
we always subtract the opposite sign number
eg :- -1 and -2
1 and 2 both have same sign i.e. negative
so the number 1 and 2 will be added i.e answer will be -3

and

if we have -2 and +1
2 and 1 both have different signs
so we will subtract them i.e. -2+1 =-1
and the sign will be there of the greater no.

hope it will help you
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how we add the sub and add Related: Examples(NCERT): Word Problems for Addition and Subtraction of Integers?
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