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Adding and Subtracting Fractions

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by

Mr Mattock

on 9 May 2016

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Transcript of Adding and Subtracting Fractions

Adding and Subtracting Fractions
Starter
Adding and Subtracting Fractions
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.
What fraction is shaded?
Can you show how the two shaded fractions below combine to give the one above.
-
+
Main Activity 1
Red
Amber
Green
Left
Right
Answers
Red
Amber
Green
Starter
What fraction is shaded?
Can you show how the two shaded fractions below combine to give the one above.
Adding and Subtracting Fractions
3
8
1
6
What would the total shaded area be if you
combined these diagrams?

What is the difference in the shaded areas?
Adding Fractions
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
Adding and Subtracting Fractions
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
Answers

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