YEAR 4

EQUIVALENT FRACTIONS

Fractions Lesson 3Understanding equivalent

fractions

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These numbers are called

fractions12 3

15

56

23

47

1222

Today’s lesson looks at

Equivalent fractions

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68

WALT : to understand equivalent fractions and

decide if fractions are equal

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In the word equivalentthere is the root word

equal

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Fractions which are said to be equivalent are equal to

each other.

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For example

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

would you both have the same amount?12

24

Yes!These fractions are equal.

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These are equivalent fractions.

Can you tell if the following fractions are

equal?Are they equivalent

fractions?12

36

Yes these fractions are equal.

They are equivalent fractions.

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36

Are they equivalent fractions?

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46

Yes they are equivalent fractions.

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46

Are they equivalent fractions?

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312

Yes they are equivalent fractions.

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312

Are they equivalent fractions?

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2 5

No, they are not equal.They are not equivalent

fractions.

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2 5

Here are some equivalent fractions.

Can you work out a strategy for deciding

whether they are equal?

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2 8

Here are some equivalent fractions.

Can you work out a strategy for deciding

whether they are equal?

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4 10

Here are some equivalent fractions.

Can you work out a strategy for deciding

whether they are equal?

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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

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

bottom number.

1 5

5 20

divide by 5

divide by 5

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

bottom number.

1 2

2 4

divide by 2

divide by 2

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

bottom number.

1 4

3 12

divide by 3

divide by 3

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

bottom number.

1 5

4 20

divide by 4

divide by 4

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

bottom number.

1 4

2 8

divide by 2

divide by 2

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

bottom number.

9 15

3 5

multiply by 3

multiply by 3

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

bottom number.

4 18

2 9

multiply by 2

multiply by 2

What is the missing number?

2 10

1 5

Click for answer

What is the missing number?

2 4

4 8

Click for answer

What is the missing number?

4 5

32 40

Click for answer

Sometimes you might need to work out equivalent fractions in

three steps.

6 8

48 64

3 4

Divide by 8

Divide by 8

Divide by 2

Divide by 2

Sometimes you might need to work out equivalent fractions in

three steps.

6 10

48 80

3 ?

Divide by 8

Divide by 8

Divide by 2

Divide by 2

What is the missing number?

Click for answer

5

Sometimes you might need to work out equivalent fractions in

three steps.

6 10

48 80

3 ?

Divide by 8

Divide by 8

Divide by 2

Divide by 2

What is the missing number?

Click for answer

LO: To revise work equivalent fractions

I understand these ideas fully.

I have some understanding but I need more practice.

I don’t understand these ideas at all and need to work again on this unit of work.

A

B

C

End of slide showEnd of slide show