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Fractions Lesson 3Understanding equivalent fractionsAn interactive Qwizdom lesson
These numbers are called
fractions12 3
15
56
23
47
1222
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 friend was given half a cake
would you both have the same amount?12
24
Yes!These fractions are equal.
12
24
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.
12
36
Are they equivalent fractions?
23
46
Yes they are equivalent fractions.
23
46
Are they equivalent fractions?
14
312
Yes they are equivalent fractions.
14
312
Are they equivalent fractions?
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
Here are some equivalent fractions.
Can you work out a strategy for deciding
whether they are equal?
25
4 10
Here are some equivalent fractions.
Can you work out a strategy for deciding
whether they 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
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
