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  1-4.
PROPERTIES OF ZERO (0)
a. a X 0 = 0
Example: 5 X 0 = 0
b.
a
If -- = 0, then a = 0
b
Example: 0
--=0
3
1-5.
PROPERTIES OF NEGATIVE NUMBERS
a. (-a) (-b) = ab
Example: (-3) (-4) = 12
NOTE:
When no arithmetic operator (+, -, ÷) is present between two real numbers,
one or both being placed in parentheses, multiplication is implied.
b. (-a) b = - (ab)
Example: (-2)3 = -6
c. -a = (-1)a
Example: -13 = (-1) 13
1-6.
PROPERTIES OF FRACTIONS
a. a
c.
-- = -- if and only if ad = bc
b
d
Example:
4
8
--=--
since (4) (4) = (2) (8)
2
4
b. a
c a+c
-- + -- = ------
b
b
b
MD0837
1-4
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