1. 5 Minute Check 2 Complete in your notebook. 1 1. 3 x 12 3 2. 7 x 8 5

2. 5 Minute Check
Complete in your notebook x 12

3. 1 12 12 5 Minute Check Complete in your notebook. 1 1. 3 x 12
3 x 1 = = 4

4. 5 Minute Check
Complete in your notebook x 8

5. 3 8 24 3 5 Minute Check Complete in your notebook. 3 2. 7 x 8
7 x 1 = = 3 7

6. 5 Minute Check
Complete in your notebook x 15

7. 5 15 60 5 Minute Check Complete in your notebook. 5 3. 6 x 15
6 x 1 = = 10

8. 5 Minute Check
Complete in your notebook. 2
x 11

9. 5 Minute Check 2 Complete in your notebook. 4. 5 x 11 2 11 22 2
5 x = = 4 5

10. Flashcards!

11. Lesson 4.3 Multiply Fractions
Wednesday, Oct 23
Lesson 4.3 Multiply Fractions

12. Multiply Fractions
Objective: To understand how to multiply fractions.

13. Multiply Fractions
At the end of this lesson you should be able to answer the following question. If two positive fractions are less than one, why is the product also less than one?

14. Multiply Fractions
To multiply fractions, multiply the numerators and multiply the denominators, then simplify if needed. Example x = x 5 = 20 = 10 x =

15. Multiply Fractions
Multiply x 5 = Estimate? Reminder – When estimating the product of two fractions, round each fraction to 0, ½ or 1 and then multiply.

16. Multiply Fractions
Multiply x 5 = x 2 = 4 Actual Product?

17. Is this a reasonable answer?
Multiply Fractions
Multiply.
2 x 5 =
Actual Product?
2 x 5 = 10
Is this a reasonable answer?

18. Multiply Fractions and Whole Numbers
2 x 5 =
Actual Product?
2 x 5 = 10
Is this a reasonable answer? 10 ≈ 4

19. Multiply Fractions
Multiply x 6 = Do this on your own.

20. Multiply Fractions
Multiply x 6 = Estimate?

21. MuMultiply Fractions
Multiply x 6 = x 1 = 2 Actual Product?

22. Is this a reasonable answer?
Multiply Fractions
Multiply.
3 x 6 =
Actual Product?
3 x 6 = 18 = 9
Is this a reasonable answer?

23. Is this a reasonable answer? 9 ≈ 2
Multiply Fractions
Multiply.
3 x 6 =
Actual Product?
3 x 6 = 18 = 9
Is this a reasonable answer? 9 ≈ 2

24. Multiply Fractions
If the numerators and denominators have a common factor you can simplify before multiplying.

25. Multiply Fractions
If the numerators and denominators have a common factor you can simplify before multiplying.
Example
3 x 6 =
All numbers are prime factors (which means they have no factors other than one and itself), except for 6. What are the factors of 6?

26. Are there any factors that appear in the numerator and denominator?
Multiply Fractions
If the numerators and denominators have a common factor you can simplify before multiplying.
Example
3 x 6 =
3 x 2 x 3 =
Are there any factors that appear in the numerator and denominator?

27. 2 5 3 x 2 x 3 = Multiply Fractions 2 5 3 x 6 = 2 the common to both
If the numerators and denominators have a common factor you can simplify before multiplying.
Example
3 x 6 =
3 x 2 x 3 =
2 the common to both

28. 2 5 5 3 x 2 x 3 = 9 Multiply Fractions 2 5 3 x 6 =
If the numerators and denominators have a common factor you can simplify before multiplying.
Example
3 x 6 =
3 x 2 x 3 = 9
We can cancel the both 2’s.

29. Multiply Fractions
Multiply. 4 9 x 18 = Do this on your own.

30. Multiply Fractions Multiply. 4 9 x 18 = 9 x 1 = 9 x 1 = 1 = 8

31. Multiply Fractions
Multiply. 3 5 x 10 = Do this on your own.

32. Multiply Fractions Multiply. 3 5 x 10 = 5 x 1 = 5 x 1 = 1 = 6

33. Multiply Fractions Do this on your own.
Frank had ½ of the lawn left to mow. On Saturday he mowed 2/3 of what was left. What fraction of the lawn did he mow on Saturday?
Do this on your own.

34. Multiply Fractions 1 2 2 1 2 x 3 = 6 = 3
Frank had ½ of the lawn left to mow. On Saturday he mowed 2/3 of what was left. What fraction of the lawn did he mow on Saturday?
2 x 3 = 6 = 3

35. Multiply Fractions
A paint store has 35 gallons of paint in storage, 2/5 of which are for outdoor use. The others are for indoor use. If each gallon costs $22, what is the total cost of the indoor paint in storage? Do this on your own.

36. Multiply Fractions
A paint store has 35 gallons of paint in storage, 2/5 of which are for outdoor use. The others are for indoor use. If each gallon costs $22, what is the total cost of the indoor paint in storage? There is a couple of different ways to solve this problem. If 2/5 is outdoor paint, what fraction is indoor paint?

37. Multiply Fractions
A paint store has 35 gallons of paint in storage, 2/5 of which are for outdoor use. The others are for indoor use. If each gallon costs $22, what is the total cost of the indoor paint in storage? If 2/5 is outdoor paint, what fraction is indoor paint? 3/5 What is 3/5 of 35 gallons?

38. Multiply Fractions 3 35 105 5 x 1 = 5 = 21
A paint store has 35 gallons of paint in storage, 2/5 of which are for outdoor use. The others are for indoor use. If each gallon costs $22, what is the total cost of the indoor paint in storage?
If 2/5 is outdoor paint, what fraction is indoor paint? 3/5
What is 3/5 of 35 gallons?
5 x 1 = 5 = 21
What is the cost of 21 gallons?

39. Multiply Fractions
A paint store has 35 gallons of paint in storage, 2/5 of which are for outdoor use. The others are for indoor use. If each gallon costs $22, what is the total cost of the indoor paint in storage? What is the cost of 21 gallons? 21 x $22 = $462

40. Multiply Fractions
If two positive fractions are less than one, why is the product also less than one?

41. Multiply Fractions
Agenda Notes Homework – Homework Practice 4-3 Show all Work Due Thursday, Oct 24 Mid Chapter 4 Quiz –Monday, Oct 28