Fractions lesson3 (3)
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Transcript of Fractions lesson3 (3)
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
Fractions Lesson 3Understanding equivalent
fractions
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
These numbers are called
fractions12 3
15
56
23
47
1222
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
Here are some
mixed numbers
325
146
8
13
49
1 22 5
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
Today’s lesson looks at
Equivalent fractions
34
68
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
WALT : to understand equivalent fractions and
decide if fractions are equal
34
68
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
In the word equivalentthere is the root word
equal
34
68
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
Fractions which are said to be equivalent are equal to
each other.
34
68
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
For example
12
24
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
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
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
Yes!These fractions are equal.
12
24
These are equivalent fractions.
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
Can you tell i f the following fractions are equal?Are they equivalent
fractions?
12
36
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
Yes these fractions are equal.
They are equivalent fractions.
12
36
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
Are they equivalent fractions?
23
46
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
Yes they are equivalent fractions.
23
46
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
Are they equivalent fractions?
14
312
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
Yes they are equivalent fractions.
14
312
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
Are they equivalent fractions?
13
2 5
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
No, they are not equal.They are not equivalent
fractions.
13
2 5
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
Here are some equivalent fractions.
Can you work out a strategy for deciding whether they
are equal?
14
2 8
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
Here are some equivalent fractions.
Can you work out a strategy for deciding whether they
are equal?
25
4 10
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
Here are some equivalent fractions.
Can you work out a strategy for deciding whether they
are equal?
13
3 9
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
Use thinking time to discuss.
312
1 4
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
Use thinking time to discuss.
1 2
5 10
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
What ideas have you come up with?
1 2
5 10
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
Explain your strategy to the class.
1 2
5 10
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
There is a relationship between the fractions using
dividing and multiplying.
1 4
5 20
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
What ever you do to the top number . . You must do to the
bottom number.
1 4
5 20
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
What ever you do to the top number . . You must do to the
bottom number.
1 4
5 20
divide by 5
divide by 5
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
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
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
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
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MALT©2006 Maths/Fractions Slide Show : Lesson 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
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
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
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
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
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MALT©2006 Maths/Fractions Slide Show : Lesson 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
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
What is the missing number?
10
1 5
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
What is the missing number?
4
4 8
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
What is the missing number?
4
32 40
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
Well done
4
32 40 5
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
Sometimes you might need to work out equivalent fractions in
three steps.
6 8
48 64
3 4
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
Follow up taskH7 Textbook
Page 38Questions 1,2,3
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
Answers
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MALT©2006 Maths/Fractions Slide Show : Lesson 3
End of this lesson, any questions or comments?