The addition of two whole numbers is the total amount of those quantities combined.

Addition is written using the plus sign  “+” between the terms; that is, in infix notation. The result is expressed with an equals sign.

Example: $1 + 1 = 2$ (“one plus one equals two”) $2 + 2 = 4$ (“two plus two equals four”) and etc.,  If signs are the same, add and keep the sign same:

Case 1: If sign of both numbers are positive,then the result will have positive sign.

For example:

(a) (+3) + (+6) = (+9)

(b) (+18) + (+2) = (+20) and etc.,

Case 2: If signs o both numbers are negative,then the result will have negative sign.

For example:

(c) (-3) + (-6) = (-9)

(d) (-18) + (-2) = (-20) and etc.,

If signs are different, then subtract and keep the sign of larger value.

Case 1: If sign of the larger value us positive sign, then, the result will have positive sign.

For example:

(e) (+6) + (-3) = (+3)

(f) (-2) + (+18) = (+16)

Case 2: If sign of the larger value us negative sign, then, the result will have negative sign.

For example:

(e) (-6) + (+3) = (-3)

(f) (+2) + (-18) = (-16)