1. Adding, Subtracting, Multiplying, and Dividing Fractions
By: Mr. Menjivar

2. Add, Subtract, Multiply, and Divide Fractions Reflection
Observe,
Question,
Comment
09/02/11
09/02/11
Add, Subtract, Multiply, and
Divide Fractions Reflection
Add, Subtract, Multiply, and Divide
Fractions
Warm-Up: 8L 8R 2

3. Warm-Up Change the Improper Fraction to Mixed Number
#1) #2)
Change the Mixed Number to Improper Fraction
#3) #4)

4. Add, Subtract, Multiply, and Divide Fractions Reflection
Observe,
Question,
Comment
09/02/11
09/02/11
Add, Subtract, Multiply, and
Divide Fractions Reflection
Add, Subtract, Multiply, and Divide
Fractions
Warm-Up:
Standard 8L 8R 4

5. Standard
Number Sense 2.2: Add and subtract fractions by using factoring to find common denominators.
Number Sense 1.2: Add, subtract, multiply, and divide rational numbers (fractions).

6. Add, Subtract, Multiply, and Divide Fractions Reflection
Observe,
Question,
Comment
09/02/11
09/02/11
Add, Subtract, Multiply, and
Divide Fractions Reflection
Add, Subtract, Multiply, and Divide
Fractions
Warm-Up:
Standard
Objective 8L 8R 6

7. Objective To add and subtract fractions
To multiply and divide fractions

8. Add, Subtract, Multiply, and Divide Fractions Reflection
Observe,
Question,
Comment
09/02/11
09/02/11
Add, Subtract, Multiply, and
Divide Fractions Reflection
Add, Subtract, Multiply, and Divide
Fractions
Warm-Up:
Standard
Objective
Vocabulary 8L 8R 8

9. Fraction Your Definition:
Are numbers expressed as the ratio of two numbers

10. Numerator
Your Definition:
Tells the desired outcome

11. Denominator Your Definition:
Tells you how many things are there in total

12. Improper Fraction Your Definition:
They’re fractions where the numerator is bigger than the denominator.

13. Add, Subtract, Multiply, and Divide Fractions Reflection
Observe,
Question,
Comment
09/02/11
09/02/11
Add, Subtract, Multiply, and
Divide Fractions Reflection
Add, Subtract, Multiply, and Divide
Fractions
Warm-Up:
Standard
Objective
Vocabulary
Notes/Examples 8L 8R 13

14. Fractions There are a few “special” fractions
How do you write 7 as a fraction? 7 1
How do you write 1 as a fraction?
3 101
How do you write 0 as a fraction?
0 0

15. Let’s apply them… :-)
(Use GCF if lost…)
4 9
2 9
1 10
7 10

16. Parallel Instructions
4 9
2 9
2 7
14 7

17. Add, Subtract, Multiply, and Divide Fractions Reflection
Observe,
Question,
Comment
09/02/11
09/02/11
Add, Subtract, Multiply, and
Divide Fractions Reflection
Add, Subtract, Multiply, and Divide
Fractions
Warm-Up:
Standard
Classwork #1
Objective
Vocabulary
Notes/Examples 8L 8R 17

18. Try these on your own =) 1 9 −5 9 4 5 3 5 −5 6 4 6 5 9 −5 9 3 11 6 11
1.) 4.) 2.) 5.) 3.)
−5 6
4 6
5 9
−5 9
3 11
6 11

19. Add, Subtract, Multiply, and Divide Fractions Reflection
Observe,
Question,
Comment
09/02/11
09/02/11
Add, Subtract, Multiply, and
Divide Fractions Reflection
Add, Subtract, Multiply, and Divide
Fractions
Warm-Up:
Standard
Classwork #1
Objective
Vocabulary
Notes/Examples
Back To The NOTES!!!!!!!!!!!!! 8L 8R 19

20. What if the denominators are different?
Step 1: Get a Common Denominator
1 6 − 3 4

21. What if the denominators are different?
Step 2: Make the denominators the same

22. What if the denominators are different?
Step 3: Change numerators accordingly

23. What if the denominators are different?
Step 4: Perform necessary operation

24. Parallel Example Teacher (left) ; Student (right)
1 4
2 5
9 10
2 5

25. Parallel Example Teacher (left) ; Student (right)
−5 6
3 8
3 4
−2 5

26. Parallel Instruction
2 1 4 − −2 5 6

27. Word Problem
Suppose one day you rode a bicycle for hours and jogged for hours. How many hours did you exercise?

28. BrainPop
Adding and Subtracting

29. Add, Subtract, Multiply, and Divide Fractions Reflection
Observe,
Question,
Comment
09/02/11
09/02/11
Add, Subtract, Multiply, and
Divide Fractions Reflection
Add, Subtract, Multiply, and Divide
Fractions
Warm-Up:
Standard
Classwork #1
Objective
Classwork #2
Vocabulary
Notes/Examples 8L 8R 29

30. Classwork #2

31. Add, Subtract, Multiply, and Divide Fractions Reflection
Observe,
Question,
Comment
09/02/11
09/02/11
Add, Subtract, Multiply, and
Divide Fractions Reflection
Add, Subtract, Multiply, and Divide
Fractions
Warm-Up:
Standard
Classwork #1
Objective
Classwork #2
Vocabulary
Homework
Notes/Examples 8L 8R 31

32. Homework
Pg. 313 [1-6 all and all]
Pg. 314 [1-11 all]

33. Exit Slip

34. Multiplying Fractions
All you do is multiply straight across!
1 4
1 4
1 16
4 5
2 5
8 25

35. Parallel Example Teacher (left) ; Student (right)
5 9
2 9
3 7
2 7

36. Parallel Example Teacher (left) ; Student (right)
−2 3 4
−5 2 3
−1 3 7
4 1 10

37. Dividing is just like multiplying…
Dividing Fractions
Dividing is just like multiplying…
EXCEPT!!!
You are going to multiply the first fraction by the reciprocal of the second fraction.

38. It is the flipped version of a fraction.
Dividing Fractions
What is a reciprocal?
It is the flipped version of a fraction.
The reciprocal of
4 5
5 4

39. Lets Take The Reciprocal Of Each Number
4 7
3 10 5
1 2

40. Dividing Fractions
1 2
− 1 3

41. Parallel Example Teacher (left) ; Student (right)
1 4
− 2 5
− 9 10
− 2 5

42. Parallel Example Teacher (left) ; Student (right)
5 6
3 8
3 4
2 5

43. BrainPop Multiplying and Dividing Fractions
Break Time!

44. Add, Subtract, Multiply, and Divide Fractions Reflection
Observe,
Question,
Comment
09/01/11
09/01/11
Add, Subtract, Multiply, and
Divide Fractions Reflection
Add, Subtract, Multiply, and Divide
Fractions
Warm-Up:
Standard
Classwork
Objective
Vocabulary
Notes/Examples 8L 8R 44

45. Classwork

46. Add, Subtract, Multiply, and Divide Fractions Reflection
Observe,
Question,
Comment
09/01/11
09/01/11
Add, Subtract, Multiply, and
Divide Fractions Reflection
Add, Subtract, Multiply, and Divide
Fractions
Warm-Up:
Standard
Classwork
Objective
Homework:
Vocabulary
Notes/Examples 8L 8R 46

47. Homework
Pg. 315 [1-8 all and all and 21-23]

48. Exit Slip