fractions lesson3 (3)

MALT©2006 Maths/Fractions Slide Show : Lesson 3

Fractions Lesson 3Understanding equivalent

fractions


These numbers are called

fractions12 3

15

56

23

47

1222


Here are some

mixed numbers

325

146

8

13

49

1 22 5


Today’s lesson looks at

Equivalent fractions

34

68


WALT : to understand equivalent fractions and

decide if fractions are equal

34

68


In the word equivalentthere is the root word

equal

34

68


Fractions which are said to be equivalent are equal to

each other.

34

68


For example

12

24


So if you were given 2 quarters of a cake and your fr iend was given half a cake

would you both have the same amount?1

224


Yes!These fractions are equal.

12

24

These are equivalent fractions.


Can you tell i f the following fractions are equal?Are they equivalent

fractions?

12

36


Yes these fractions are equal.

They are equivalent fractions.

12

36


Are they equivalent fractions?

23

46


Yes they are equivalent fractions.

23

46



14

312


Yes they are equivalent fractions.

14

312



13

2 5


No, they are not equal.They are not equivalent

fractions.

13

2 5


Here are some equivalent fractions.

Can you work out a strategy for deciding whether they

are equal?

14

2 8




are equal?

25

4 10




are equal?

13

3 9


Use thinking time to discuss.

312

1 4


Use thinking time to discuss.

1 2

5 10


What ideas have you come up with?

1 2

5 10


Explain your strategy to the class.

1 2

5 10


There is a relationship between the fractions using

dividing and multiplying.

1 4

5 20


What ever you do to the top number . . You must do to the

bottom number.

1 4

5 20



bottom number.

1 4

5 20

divide by 5

divide by 5



bottom number.

1 2

2 4

divide by 2

divide by 2



bottom number.

1 4

3 12

divide by 3

divide by 3



bottom number.

1 5

4 20

divide by 4

divide by 4



bottom number.

1 4

2 8

divide by 2

divide by 2



bottom number.

9 15

3 5

multiply by 3

multiply by 3



bottom number.

4 18

2 9

multiply by 2

multiply by 2


What is the missing number?

10

1 5



4

4 8



4

32 40


Well done

4

32 40 5


Sometimes you might need to work out equivalent fractions in

three steps.

6 8

48 64

3 4


Follow up taskH7 Textbook

Page 38Questions 1,2,3


Answers


End of this lesson, any questions or comments?

fractions lesson3 (3)

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