Some important points:
(i) The sum of two positive integers is always positive.
(ii) The sum of two negative integers is always negative.
(iii) The sum of two integers of which one is positive and the other is negative could be positive, negative, or zero.
Adding integers of the same sign:
When adding integers of the same sign, we add their absolute values, and give the result the same sign.
Examples:
(i) (+2)+(+3) = +5
(ii) (7) + (2) = (7 + 2) = 9
(iii) (80) + (34) = (80 + 34) = 114
(iv) (3)+(2) = 5
Adding integers of opposite sign:
When adding integers of the opposite signs, we take their absolute values, subtract the smaller from the larger, and give the result the sign of the integer with the larger absolute value.
Examples:
(i) (2)+(+3) = +1.
(ii) (+3)+(2) = +1.
(iii) (+2)+(3) = 1.
(iv) (4)+(4) = 0.
Directions: Solve the following addition problems. In your answer, indicate the sign, only if the integer is negative. Also write at least ten examples of your own.
