ASSOCIATED
WITH
INTEGERS
Remember
:Any number that has no
sign in front of the
number is POSITIVE.
ADDITION
Case 1: Signs are the same
If the signs are the same,
add and keep the same
sign.
(+)+(+)= add the numbers
and the answer is
positive.
Example: 2 + 5 = 7
(-)+(-)= add the numbers
and the answer is
Negative.
Example: -5 + -4 = -9
Case 1: Signs are different
If the signs are different,
subtract the numbers and
use the sign of the bigger
number.
(-)+(+)=subtract the
numbers and take the
sign of the larger number.
Example: -5 + 4 = -1
Example: 5 + (-4) =1
and
Case 1: Signs are same
dividing
If the signs are same,
the answer is always
positive
(+) x (+) = +
(+) ÷ (+) = +
Example: 5 x 4 = 20
(-) x (-) = +
Example: 16÷4 = 4
Example: -5 x -5 = 25
(-) ÷ (-) = +
Example: -25 ÷ -5 = 5
Case 2: Signs are different
If the signs are different
the answer is always
negative.
(+) x (-) = -
Example: 6 x (-10) = -60
(+)÷(-) = -
(-) x (+) = -
Example: 30 x (-15) = -2
Example: -3 x 11 = -33
(-) ÷ (+) = -
Example: -25 ÷ 5 = -5
Assignment
discuss the rules on
subtracting integers and
give some examples.