Addition of integers

N.B. :

(+) (+)= +              (-) (+)= -

(-) (+)= -                (-) (-)= +

Examples: evaluate;

1. -4+ -3= -4-3= -7                 c) +8+-6= 8-6= 2
2. +5++4= +9

Subtraction of integers

Examples: evaluate;

1. +3- -2= 3+2= 5
2. -3- +2= -3-2= -5
3. -3+ +2= -3+2= -1

Multiplication and division of integers

(+) x (+)= +                   (+) ÷ (+)= +

(+) x (-) = -                     (+) ÷ (-)= -

(-) x (+) = -                       (-) ÷ (+) = -

(-) x (-) = +                        (-) ÷ (-) = +

Examples;

1. +4 x +5 = +20           d) -20 ÷ 5 = -4
2. -6 x 10 = -60             e) 30 ÷ -3 = =10
3. -2 x -1 = 2                  f) -18 ÷ -2 = 9