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by

## Mr Mattock

on 9 May 2016

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#### Transcript of Adding and Subtracting Fractions

Starter
1 1
5 9

13 5
16 12
Further examples
L.O. - To understand how we add and subtract fractions, and add and subtract two fractions.
Can you show how the two shaded fractions below combine to give the one above.
-
+
Main Activity 1
Red
Amber
Green
Left
Right
Red
Amber
Green
Starter
Can you show how the two shaded fractions below combine to give the one above.
3
8
1
6
What would the total shaded area be if you
combined these diagrams?

What is the difference in the shaded areas?
3
8
1
6
13
24
2 rows each
because both
in 2 x table
Subtracting Fractions
3
8
1
6
5
24
2 rows each
because both
in 2 x table
1 1
5 9

13 5
16 12
-
+
9 5 14
45 45 45
+
=
39 20 19
48 48 48
-
=
=
=
Further examples
9 2 11
12 12 12
14 9 5
18 18 18
+ =
- =
Key
Examples

Activities
Activity

Worked
Examples

Worked
Example

Worked
Example

Starter Lesson 2
Shazad is asked to write down the fraction shaded here. He says "the rectangle has 12 pieces, and 7 shaded pieces, so the fraction is .

Shazad is wrong. Write a sentence explaining why.
7
12
Starter Lesson 2
Shazad is asked to write down the fraction shaded here. He says "the rectangle has 12 pieces, and 7 shaded pieces, so the fraction is .

Shazad is wrong. Write a sentence explaining why.
7
12
Shazad is wrong because the pieces in the rectangle
are different sizes.
Full transcript