Addition and Subtraction of integers
Channel: Shamim Hussain
Date: 02/06/2018

3.9. Addition and Subtraction of integers:
In case of addition of two integers (algebraic sum) we have to add two integers of same sign and subtract smaller integer (without sign) from larger integer (without sign) of different sing. In both cases it is required to put the sign of greater or equal numbers (without sign).
Examples
 
1. Add 6 and 2.
2. Add 6 and -2.
3. Add -6 and 2.
4. Add -6 and -2.
5. Add 6 and 6.
6. Add -2 and -2.
7. Add 1, -2, 3 and -4


 

Solution: 
1. 6 + 2 = 8
2. 6 + (-2) = 6 – 2 = 4
3. (-6) + 2 = -6 + 2 = -4
4. (-6) + (-2) = -6 – 2 = -8
5. 6 + 6 = 12
6. (-2) + (-2) = -2 -2 = -4
7. 1 + (-2) + 3 + (-4) = 1 -2 +3 -4 = -1 -1 = -2