Multiplying Fractions - Complete Lesson Preview

1. Fractions – Multiplying – Complete Lesson Preview the presentation to check ability-level, AFL questions, and the animations during demonstrations. It is recommended to delete slides/sections not needed for your class.

3. Printing To print handouts from slides - Select the slide from the left. Then click: File > Print > ‘Print Current Slide’ To print multiple slides - Click on a section title to highlight all those slides, or press ‘Ctrl’ at the same time as selecting slides to highlight more than one. Then click: File > Print > ‘Print Selection’ To print double-sided handouts - Highlight both slides before using ‘Print Selection’. Choose ‘Print on Both Sides’ and ‘Flip on Short Edge’.

4. 10 x3 ÷2 -5 x2 x5 +5 ÷5 16 ?? ÷10 -5 x8

5. 01 March 2019 Multiplying Fractions

6. KNOWLEDGE CHECK

7. KNOWLEDGE CHECK

8. Georgie took a of the cake! She split the piece into 3 and gave one piece each to Tom and Rob. How big was the piece Tom ate? of means

9. How do we find the area of a field? 8 metres 6 metres Area = 8 × 6 = 48 metres2

10. What if we want to find the area of half the length, and half the width? 4 metres 3 metres We can see it is a quarter of the whole field.

11. What if we want to find the area of half the length, and a third of the width? What fraction of the field is the area? ? or or

12. This is an easy way to multiply fractions.

13. What is the fraction for… What is the fraction for…

14. What is the fraction for… What is the fraction for…

15. Draw diagrams in your books to help calculate the answers. 2) 1) 3) 3)

16. Draw diagrams in your books to help calculate the answers. 2) 1) 3) 3) Can we make this fraction simpler? Answers

17. Draw diagrams in your books to help calculate the answers. 2) 1) Can we write a rule for multiplying fractions, just using numbers? 3) 3) Can we make this fraction simpler? Answers

18. To multiply fractions, multiply the numerator, then multiply the denominator. ANNA says…. Is Anna right?

19. To quickly multiply fractions we multiply the numerators and multiply the denominators (1 x 1) (1) (6) (2 x 3)

20. To quickly multiply fractions we multiply the numerators and multiply the denominators (1 x 2) (2) (9) (3 x 3)

21. To quickly multiply fractions we multiply the numerators and multiply the denominators (1 x 2) Can we simplify this fraction? (2) (12) (4 x 3)

22. To quickly multiply fractions we multiply the numerators and multiply the denominators (2 x 1) Can we simplify this fraction? (2) (15) (3 x 5)

23. To quickly multiply fractions we multiply the numerators and multiply the denominators (3 x 2) Can we simplify this fraction? (6) (20) (4 x 5)

24. To quickly multiply fractions we multiply the numerators and multiply the denominators (5 x 3) Can we simplify this fraction? (15) (30) (6 x 5)

25. What’s wrong? What’s the answer? Sarah Julie

27. Answers

28. Ben, Bob and Bill split a pizza equally. • Ben gave half his pizza to • his sister, Anna. What fraction of the whole Pizza did Anna get? Ben Bob Bill Anna Anna got of the whole pizza.

29. Jim, Jane, Jack and John split a pizza equally. • Jim gave half his pizza to • his brother, David. What fraction of the whole Pizza did David get? Jim Jane Jack John David David got of the whole pizza.

30. Mary split her birthday cake into 8 equal pieces. • Sally split one of the pieces into two. What fraction of the whole cake is one of Sally’s pieces?

31. Mary split her birthday cake into 7 equal pieces. • Sally split one of the pieces into 3. What fraction of the whole cake is one of Sally’s pieces?

32. Calculate of

33. Calculate of

34. Calculate of

35. Calculate of

36. Draw diagrams in your books to help calculate the answers. of = of = of = of = of = of =

37. Draw diagrams in your books to help calculate the answers. of = of = = of = of = of = = of =

38. Multiplying Fractions : Amber Multiplying Fractions : Amber 4 5 4 5 2 1 2 1 1. a) b) 1. a) b) = = = = × × × × 5 15 7 14 5 15 7 14 Simplify! Simplify! 2 8 2 8 5 2 5 2 c) d) c) d) = = = = = = × × × × 5 27 5 27 6 3 6 3 3. Calculate the area of this rectangle. 3. Calculate the area of this rectangle. 2. a) 2. a) b) b) Multiplying Fractions : Green Multiplying Fractions : Green 1. a) b) 1. a) b) c) d) c) d) 2. a) 2. a) How can we calculate this? How can we calculate this? b) c) b) c) 3. a) 3. a) Can we make this calculation easier before multiplying? (Look again at Question 1 part d) Can we make this calculation easier before multiplying? (Look again at Question 1 part d)

39. Multiplying Fractions : Amber 4 5 2 1 1. a) b) = = × × 5 15 7 14 Simplify! 2 8 5 2 c) d) = = = × × 5 27 6 3 3. Calculate the area of this rectangle. 2. a) b) Multiplying Fractions : Green 1. a) b) c) d) 2. a) How can we calculate this? b) c) 3. a) Can we make this calculation easier before multiplying? (Look again at Question 1 part d)

40. Multiplying Fractions : Amber 4 8 5 5 Answers 2 1 1. a) b) = = × × 5 15 7 14 3 2 Simplify! 2 10 1 4 8 5 2 c) d) = = = × × 5 30 3 9 27 6 3 3. Calculate the area of this rectangle. 2. a) b) Multiplying Fractions : Green 1. a) b) c) d) 2. a) How can we calculate this? b) c) 3. a) Can we make this calculation easier before multiplying? (Look again at Question 1 part d)

41. Answers

42. Answers

43. Georgie took a of the cake! She split the piece into 4 and gave one piece to Tom, Ann and Rob. How big was the piece Ann got? of means

44. Check your success! I can multiply fractions with 1 as the numerator. I can multiply fractions with any numerator. I can multiply mixed numbers.

45. Check your success! I can multiply fractions with 1 as the numerator. I can multiply fractions with any numerator. I can multiply mixed numbers.

46. Write a text message to a friend describing… How to multiply fractions.

47. Questions? Comments? Suggestions? …or have you found a mistake!? Any feedback would be appreciated . Please feel free to email: tom@goteachmaths.co.uk