Multiplication and Division of Integers

2. Multiplying and
Dividing Integers

3. • When multiplying and
dividing integers there are
two rules:

4. Rule # 1
When multiplying or
dividing integers that have
the SAME sign, the
answer is POSITIVE.

5. • positive x positive=positive
(+)x(+)=(+)
Examples:
1. (+3 )x (+3)= (+9)
2. (+4)x(+7)=(+28)
• negative x negative = positive
(-)x(-)=(+)
Examples:
1.(-2)x (–4) = (+8)
2. (-5)x(-6)=(+30)

6. Rule # 2
When multiplying or
dividing integers whose
signs are DIFFERENT, the
answer will always be
NEGATIVE.

7. • positive x negative=negative
(+)x(-)=(-)
Examples:
1. (+2 )x (-3)= (-6)
2. (+6)x(-8)=(-48)
• negative x positive = negative
(-)x(+)=(-)
Examples:
1.(-4)x (+3) = (-12)
2. (-7)x(+9)=(-63)

8. Let’s Practice!
What sign would the answer have in
front of the integer???
(-5)x(-7)=
Positive

9. How about…
(+6) x (-9)=
Negative

10. Try this one!
What sign will be in front of the
answer???
(-81)÷(+9)=
Negative

11. Let’s solve some
problems!
(-8)x(–9)=
+72

12. (+4)x(+12)=
+48

13. (-45)÷(+5)=
-9

14. (-63)÷(+7)=
-9

15. (-8)x(–11)=
+88

16. Remember…
• When multiplying and dividing
integers:
Same signs = positive
Different signs = negative

17. Evaluation
Answer the following:
1. (+2)÷(+2)=
2. (-4)x(+8)=
3. (-121)x(-11)=
4. (+9)x(-2)=
5. (-100)÷(+1)=
6. (+4)÷(+4)=
7. (-11)x(+12)=
8. (-125)÷(-5)=

18. Assignment:
Define the following terms:
a. Fraction
b. Numerator
c. denominator
d. Proper fraction
e. Improper fraction
f. Mixed fraction
Reference: Elementary Algebra Textbook for
First Year by Julieta G. Bernabe
pages 23-25

19. Godbless!
-END