1. Math CC7/8 – Sept. 28 Math Notebook
Things Needed Today (TNT):
Math Notebook/Pencil
Math Notebook
Topic: Mult/Dividing Positive/Negative Integers
Homework: Multi/Dividing IntegersWS

2. Warm-Up
WRITE down each problem & SOLVE
Show ALL your work & THINKING

4. Multiplying and Dividing Integers

5. Rules for Multiplying & Dividing (+)/(-) Integers
When multiplying and dividing integers there are two rules:
When multiplying or dividing integers that have the SAME sign, the answer is POSITIVE.
Positive ● positive = positive
Negative ● negative = positive
+7 ● +12 = +84
-6 ● –5 = +30

6. Rules continued… Rule 2: Positive ● negative = negative
When multiplying or dividing integers whose signs are DIFFERENT, the answer will always be NEGATIVE.
Positive ● negative = negative
Negative ● positive = negative
+8 ● –4 = -32
-5 ● +7 = -35

7. Rules for Multiplying Integers
Make the vertical and horizontal lines of a tic-tac-toe game.

8. Rules for Multiplying Integers
Place three positive signs going diagonal and negative signs in the rest of the remaining places. + - - - - + - - +

9. Rules for Multiplying Integers
Now you can start from any side and go any straight direction and you will see the correct integer rule for multiplication. + -

10. Let’s Practice!
What sign would the answer have in front of the integer???
-5 • -7 = ???

11. POSITIVE!!!

12. What sign will be in front of the answer??
How about…
-6 • 9 = ???
What sign will be in front of the answer??

13. NEGATIVE!!!

14. Try this one!
What sign will be in front of the answer???
-81 / +9 = ???

15. NEGATIVE!!!

16. Let’s solve some problems!
-8 (–9) =

17. +72

18. +4 (+12) =

19. 48

20. -45 / 5 =

21. -9

22. -63 / 7 =

23. -9

24. -8 (–11) =

25. 88

26. Remember… When multiplying and dividing integers:
Same signs = a positive
Different signs = a negative

27. Practice….. 3 -1 -15 -28 24 -22 -4 -3 4 -11 – 4 15 – (-2) -1 – (-6)
-11 – – (-2) -1 – (-6)
7 • • • 2
-36 ÷ ÷ ÷ -7

28. Multiply the following fractions
Try These: Multiply
Multiply the following fractions

29. Solutions: Multiply

30. Divide the following fractions
Try These: Divide
Divide the following fractions

31. Solutions: Divide

32. / • / • / • • / / •

33. / • • / / • • / / •

36. -65 / 5 -13 points -30 / 10 -3 miles per hour 48 / -6 -8 -35 / 7 -5
Or a decreased by 3 m/h
-65 / 5
-13 points
48 / -6 -8
Average loss of 8 points per game.
-35 / 7 -5
5degrees drop each day on average