divide rational numbers.

1
ObjectiveThe student will be able to

• divide rational numbers.
• SOL none

Designed by Skip Tyler, Varina High School and
Nicole Kessinger, Deep Run High School
2
Dividing Rules

• 1) If the numbers have the same signs then the
  quotient is positive.
• -32 (-8 ) 4
• 2) If the numbers have different signs then the
  quotient is negative.
• 81 (-9) -9

3
When dividing two negative numbers, the quotient
is positive.

• True
• False

4
When dividing a negative number and a positive
number, use the sign of the larger number.

• True
• False

5
The reciprocal of a number is called its
multiplicative inverse.
A number multiplied by its reciprocal/multiplicati
ve inverse is ALWAYS equal to 1.
6
Example 1
7

• Basically, you are flipping the fraction!

We will use the multiplicative inverses for
dividing fractions.
8
Which statement is false about reciprocals?

• Reciprocals are also called additive inverses
• A number and its reciprocal have same signs
• If you flip a number, you get the reciprocal
• The product of a number and its reciprocal is 1

9
When dividing fractions, change division to
multiplying by the reciprocal.
10
(No Transcript)
11
What is the quotient of-21 -3?

• 18
• -18
• 7
• -7

12

• .
• .
• .
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