Fractions Lesson 6
Adding Fractions
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MALT©2006 Maths/Fractions Slide Show : Lesson 6
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WALT : add fractions of the
same denominator.
How many fourths would this equal?
1
1
+
4
4
MALT©2006 Maths/Fractions Slide Show : Lesson 6
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WALT : add fractions of the
same denominator.
How many fifths would this equal?
1
3
+
5
5
MALT©2006 Maths/Fractions Slide Show : Lesson 6
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3
8
+
2
8
Read aloud this sum
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3
8
+
2
8
The fractions have the same
denominator
eighths
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3
8
+
2
8
Three eighths add two eighths
equals five eighths.
eighths
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3
8
+
2
8
5
8
Three eighths add two eighths
equals five eighths.
eighths
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4
7
+
2
7
6
14
Four sevenths add two sevenths
equals six fourteenths.
Is this correct ?
Who can explain why it’s wrong ?
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4
7
+
2
7
6
14
It’s wrong because sevenths are
being added.
So the answer must be
in sevenths.
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4
7
+
2
7
6
7
Four sevenths add two sevenths
equals six sevenths.
The answer must be in
sevenths.
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4
7
+
2
7
6
7
Four sevenths add two sevenths
equals six sevenths.
When you are adding fractions, what happens to the number below the line?
Does it:
A. Stay the same – nothing happens
B. They add together
C. It goes for a walk with it’s best friend Cecil?
Next Slide
O.K. some for you to try.
You can discuss these with a friend.
Thinking time starts now !
4 + 3
8
8
4 + 1
7
7
3
6
+ 2
6
2
9
+ 5
9
Next Slide
The answers.
4 + 1
7
7
3
6
5
7
+ 2
6
4 + 3
8
8
5
6
2
9
7
8
+ 5
9
7
9
Next Slide
1
1
5
+
3
5
Read aloud this sum
Next Slide
1
1
5
+
3
5
fifths
These fractions can be added
because they have the same
denominator
Next Slide
1
1
5
+
3
5
So think about it like this….
One whole…………… add
one fifth …………… add
three fifths ……………
equals
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1
1
5
+
3
5
1
4
5
So think about it like this….
One whole…………… add
one fifth …………… add
three fifths ……………
equals
One and four fifths
Next Slide
O.K. some for you to try.
You can discuss these with a friend.
Thinking time starts now !
1
1
4 + 1
7
7
2
3
6
+ 2
6
4 + 3
8
8
1
2
9
+ 5
9
Next Slide
The answers
1
4 + 1
7
7
2
3
6
1
+ 2
6
1
5
7
2
5
6
4 + 3
8
8
1
2
9
1
7
8
+ 5
9
1
7
9
Next Slide
7
8
+
3
8
How about these factions.
Can we add these together ?
Yes we can because they are
both eighths.
eighths.
eighths
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7
8
+
3
8
How many eighths altogether ?
10
8
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7
8
+
3
8
How many eighths altogether ?
10
8
This is the right answer
but it is written as an
improper fraction.
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7
8
+
3
8
10
8
This is the right answer
but it is written as an
improper fraction.
What is ten eighths as
a mixed number?
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7
8
+
3
8
10
8
1
2
8
We change this improper fraction into a mixed number.
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7
8
+
3
8
10
8
1 1
2
8
1
4
We then simplify this fraction to get this answer.
What would this number be written as using
decimals?
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7
8
+
3
8
10
8
1 1
2
8
1
4
Any questions or comments about this bit ?
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7
8
+
3
8
10
8
1 1
2
8
1
4
Any questions or comments about this bit ?
Next Slide
7
8
+
3
8
10
8
1 1
2
8
1
4
Eighths, how many ?
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7
8
+
3
8
10
8
Eighths, how many ?
1 1
2
8
1
4
ten
Next Slide
7
8
+
3
8
10
8
1 1
2
8
1
4
Or see them as one whole and two eighths.
eighths.
Next Slide
7
8
+
3
8
10
8
1 1
2
8
1
4
Or see them as one whole and two eighths.
eighths.
Next Slide
7
8
+
3
8
10
8
1 1
2
8
1
4
Any questions or comments about this bit ?
Next Slide
7
8
+
3
8
10
8
1 1
2
8
1
4
equals
Next Slide
O.K. some for you to try.
You can discuss these with a friend.
Thinking time starts now !
4 + 3
6
6
4 + 5
7
7
3
4
+ 2
4
1
4
9
+ 7
9
Next Slide
Here come the answers !
Next Slide
O.K. the answers.
4 + 5
7
7
3
4
1
4 + 3
6
6
2
7
+ 2
4
1
1
4
1
4
9
1
1
6
+ 7
9
1
2
9
Next Slide
LO: to add fractions together including with mixed
numbers.
Last
Slide
I need more practice to help me
understand this and I made lots of
mistakes.
A
B
I am beginning to understand
this and I got many of them
correct.
C
I really understand this
and I got most of them
correct.