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Adding Real Numbers:
Positive + Positive = Positive 
5 + 3 = 8

Negative + Negative = Negative 
( 6) + ( 3) =  9

Sum of a negative and a positive number
Keep the sign of the larger number and subtract

( 6) + 3 = 3
9 + (12) =  3
( 5) + 7 = 2
4 + ( 2) = 2.

Subtracting Real Numbers:
Negative  Positive = Negative (same as adding two negative
numbers) 
( 8)  3 = 8 + (3) = 11

Positive  Negative = Positive + Positive = Positive 
4  (3) = 4 + 3 = 7

Negative  Negative = Negative + Positive =
Keep the sign of the larger number and subtract

(7)  (5) = ( 7) + 5 = 2
(5)  ( 7) = (5) + 7 = 2

Multiplying Real Numbers:
Positive x Positive = Positive 
3 x 4 = 12 
Negative x Negative = Positive 
(3) x (5) = 15 
Negative x Positive = Negative 
(3) x 2 = 6 
Positive x Negative = Negative 
3 x (2) = 6 
Dividing Real Numbers:
Positive ÷ Positive = Positive 
18 ÷ 3 = 6 
Negative ÷ Negative = Positive 
(18) ÷ (3) = 6 
Negative ÷ Positive = Negative 
(18) ÷ 3 = 6 
Positive ÷ Negative = Negative 
18 ÷ (3) = 6. 
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