INTEGERS
Rules of Addition & Subtraction
RULES OF ADDITION …

(+) + (+) = (+)
Eg: (2) + (4) = (+6)
(3) + (2) = (+5)
 (+) + (-) = (- / + ) Depends on the sign of the greater number.
Eg: (+2) + (-4) = (-2)
( +3) + (-2) = (+1)
 (-) + (-) = (-) But always add the numbers.
Eg: (-2) + (-4) = (-6)
(-3) + (-2) = (-5)
NUMBER LINE…
PRACTICE QUESTION….
Q1 a. (-10) + 4 – 6 = _____
b.
(-9) – 3 – 1 = _____
c. (-2) – 7 + 4 = _____
d. (-20) + 11 – 6 = _____
e. (-5) + 14 + (-8) = _____
f.
(-13) – 80 + 40 = _____
Q 2. At midnight, the temperature
was -2 . At 9am, the temperature
was 5 . By how many degrees did
the temperature increase?