Fractions-Multiplying-Complete-Lesson.pptx

JMKL

1. 16 x8 -5 ÷10 x2 x5 +5 ÷5 -5 ÷2 x3 10 ? ?

2. 21 November 2022 Multiplying Fractions

3.   KNOWLEDGE CHECK    

4.   KNOWLEDGE CHECK    

5. 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  

6. How do we find the area of a field? 8 metres 6 metres Area = 8 × 6 = 48 metres 2

7. 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.

8. 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 ?

9.       This is an easy way to multiply fractions.

10. What is the fraction for…         What is the fraction for…        

11. What is the fraction for…         What is the fraction for…        

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

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

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

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

16.   (2 x 3) (1 x 1) To quickly multiply fractions we multiply the numerators and multiply the denominators (1) (6)  

17.   (3 x 3) (1 x 2) To quickly multiply fractions we multiply the numerators and multiply the denominators (2) (9)  

18.   (4 x 3) (1 x 2) To quickly multiply fractions we multiply the numerators and multiply the denominators (2) (12)   Can we simplify this fraction?  

19.   (3 x 5) (2 x 1) To quickly multiply fractions we multiply the numerators and multiply the denominators (2) (15)   Can we simplify this fraction?

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

21.   (6 x 5) (5 x 3) To quickly multiply fractions we multiply the numerators and multiply the denominators (15) (30)   Can we simplify this fraction?  

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

24.                   Answers

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

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

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

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

29.       Calculate of      

30.       Calculate of      

31.       Calculate of          

32.       Calculate of                  

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

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

35. 1. a) Multiplying Fractions : Amber × = 4 5 2 15 b) × = 7 1 5 14 c) × = 2 5 5 6 d) × = 2 3 8 27   2. a)   b)     3. Calculate the area of this rectangle. = 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)   Simplify! 1. a) Multiplying Fractions : Amber × = 4 5 2 15 b) × = 7 1 5 14 c) × = 2 5 5 6 d) × = 2 3 8 27   2. a)   b)     3. Calculate the area of this rectangle. = 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)   Simplify!

36. 1. a) Multiplying Fractions : Amber × = 4 5 2 15 b) × = 7 1 5 14 c) × = 2 5 5 6 d) × = 2 3 8 27   2. a)   b)     3. Calculate the area of this rectangle. = 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)   Simplify!

37. 1. a) Multiplying Fractions : Amber × = 4 5 2 3 8 15 b) × = 5 7 1 2 5 14 c) × = 2 5 5 6 10 30 d) × = 4 9 2 3 8 27   2. a)   b)     3. Calculate the area of this rectangle. = 1 3   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)   Simplify! Answers

38. Answers

39. Answers

40. 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  

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

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

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

44. Questions? Comments? Suggestions? …or have you found a mistake!? Any feedback would be appreciated  . Please feel free to email: [email protected]