If both of the integers are positive, add their values and prefix the number with a positive sign.

 

If both of the integers are negative, add their absolute values and prefix the number with a negative sign.

 

If one integer is negative and one integer is positive, subtract the integers, and use the sign of the integer with the largest absolute value.

Examples:

14 + (-6) = 8

-14 + 6 = -8

-14 + (-6) = -20