Transcript teaching - Holy Rosary Website

Fractions Lesson 3
Understanding equivalent
fractions
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These numbers are called
1
2
fractions
3
15
5
6
2
3
4
7
12
22
Today’s lesson looks at
Equivalent
fractions
6
8
3
4
WALT : to understand equivalent
fractions and decide if fractions
are equal
6
8
3
4
In the word equivalent
there is the root word
equal
6
8
3
4
Fractions which are said to be
equivalent are equal to each
other.
6
8
3
4
For example
2
4
1
2
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?
2
4
1
2
Yes!
These fractions are equal.
2
4
These are equivalent fractions.
1
2
Can you tell if the following
fractions are equal?
Are they equivalent fractions?
3
6
1
2
Yes these fractions are equal.
They are equivalent fractions.
3
6
1
2
Are they equivalent fractions?
4
6
2
3
Yes they are
equivalent fractions.
4
6
2
3
Are they equivalent fractions?
3
12
1
4
Yes they are
equivalent fractions.
3
12
1
4
Are they equivalent fractions?
2
5
1
3
No, they are not equal.
They are not equivalent fractions.
2
5
1
3
Here are some equivalent
fractions.
Can you work out a strategy for
deciding whether they are equal?
2
8
1
4
Here are some equivalent
fractions.
Can you work out a strategy for
deciding whether they are equal?
4
10
2
5
Here are some equivalent
fractions.
Can you work out a strategy for
deciding whether they are equal?
3
9
1
3
Use thinking time to discuss.
1
4
3
12
Use thinking time to discuss.
5
10
1
2
What ideas have you come up
with?
5
10
1
2
Explain your
strategy to the class.
5
10
1
2
There is a relationship between
the fractions using dividing and
multiplying.
5
20
1
4
What ever you do to the
top number . . You must
do to the bottom number.
5
20
1
4
What ever you do to the top number . .
You must do to the bottom number.
divide by 5
1
5
5
20
divide by 5
What ever you do to the top number . .
You must do to the bottom number.
divide by 2
1
2
2
4
divide by 2
What ever you do to the top number . .
You must do to the bottom number.
divide by 3
1
4
3
12
divide by 3
What ever you do to the top number . .
You must do to the bottom number.
divide by 4
1
5
4
20
divide by 4
What ever you do to the top number . .
You must do to the bottom number.
divide by 2
1
4
2
8
divide by 2
What ever you do to the top number . .
You must do to the bottom number.
multiply by 3
3
5
9
15
multiply by 3
What ever you do to the top number . .
You must do to the bottom number.
multiply by 2
2
9
4
18
multiply by 2
What is the missing number?
1
5
Click for answer
2
10
What is the missing number?
4
8
Click for answer
2
4
What is the missing number?
32
40
Click for answer
4
5
Sometimes you might need to work out
equivalent fractions in
three steps.
Divide by 8
48
64
Divide by 2
6
8
Divide by 8
3
4
Divide by 2
Sometimes you might need to work out
equivalent fractions in
three steps.
Divide by 8
48
80
Divide by 2
6
10
Divide by 8
Click for answer
3
?
5
Divide by 2
What is the
missing
number?
LO: To revise work equivalent fractions
A
I don’t understand these ideas at
all and need to work again on this
unit of work.
B
I have some understanding but
I need more practice.
C
I understand these ideas fully.
End of slide show