Easy Algebra Step-by-Step

(Marvins-Underground-K-12) #1

Computation with Real Numbers 29


Division of Signed Numbers
Rule 8. To divide two numbers, divide
their absolute values (being care-
ful to make sure you don’t divide
by 0) and then follow the rules for
multiplication of signed numbers.

Problem Find the quotient.

a. −

120
3

b.

− 120
3

c.^120
− 3

d.

− 120
0

e.^0
30

Solution

a.



120
3
Step 1. Divide 120 by 3.
120
3

= 40


Step 2. The signs are the same (both negative), so keep the quotient positive.


=


120


3


40


b. −^120
3
Step 1. Divide 120 by 3.
120
3

= 40


P


In algebra, division is commonly indicated
by the fraction bar.

If 0 is the dividend, the quotient is 0. For
instance,^05 = 0. But if 0 is the divisor,
the quotient is undefi ned. Thus,^5
0 ≠^0
and^50 ≠ 5. 50 has no answer because
division by 0 is undefi ned!
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