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Addition of integers:

a) When integers have like sign i.e., when both the integers to be added are either positive or negative, add their absolute values and assign the same sign to the sum.

i) +57 and +112

ii) -32 and -83

Therefore (+ 57) + (+ 112) = + 169

ii) Here, both the numbers to be added are negative and their absolute values are 32 and 83 respectively.

The sum of their absolute values = 32 + 83 = 115

Therefore (- 32) + (- 83) = - 115

Thus, on adding two or more positive integers, we always get a positive number. Similarly, on adding two or more negative integers, we always get a negative number.

b) When the integers have unlike sign i.e., one is positive and the other is negative: -

Determine the difference of their absolute values and to this difference assign the sign of integer of greater absolute value.

And their difference = 53 – 29 = 24

Since, the integer with the greater absolute value is 53 and its sign is ‘ + ‘.

Therefore (+ 53) + (- 29) = + 24