Adding, Subtracting, Multiplying, and Dividing Fractions

# Adding, Subtracting, Multiplying, and Dividing Fractions

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## Adding, Subtracting, Multiplying, and Dividing Fractions

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

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

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

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

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

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

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

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

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 3 101 How do you write 0 as a fraction? 0 0 5 100

15. Let’s apply them… :-) • (Use GCF if lost…)

16. Parallel Instructions

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

18. Try these on your own =) 1.) 4.) 2.) 5.) 3.)

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

20. What if the denominators are different? • Step 1: Get a Common Denominator

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 ExampleTeacher (left) ; Student (right)

25. Parallel ExampleTeacher (left) ; Student (right)

26. Parallel Instruction

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

30. Classwork #2

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

32. Homework • Pg. 313 [1-6 all and 13-16 all] • Pg. 314 [1-11 all]

33. Exit Slip

34. Multiplying Fractions All you do is multiply straight across!

35. Parallel ExampleTeacher (left) ; Student (right)

36. Parallel ExampleTeacher (left) ; Student (right)

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

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

39. Dividing Fractions

40. Parallel ExampleTeacher (left) ; Student (right)

41. Parallel ExampleTeacher (left) ; Student (right)

42. BrainPop Multiplying and Dividing Fractions • Break Time!

43. 09/01/11 09/01/11 Observe, Question, Comment Add, Subtract, Multiply, and Divide Fractions Add, Subtract, Multiply, and Divide Fractions Reflection Warm-Up: Standard Classwork Objective Vocabulary Notes/Examples 8L 8R

44. Classwork

45. 09/01/11 09/01/11 Observe, Question, Comment Add, Subtract, Multiply, and Divide Fractions Add, Subtract, Multiply, and Divide Fractions Reflection Warm-Up: Standard Classwork Objective Homework: Vocabulary Notes/Examples 8L 8R

46. Homework • Pg. 315 [1-8 all and 11-17 all and 21-23]

47. Exit Slip