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Fractions

Adding, subtracting and multiplying fractions
by

Anthony Barraclough

on 12 July 2011

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Transcript of Fractions

Fractions
Starter
Simplify the following fractions
10/50

12/78

63/315

13/78

16/72
1/5

2/13

1/5

1/6

2/9
Refresh fraction knowledge including...

Adding and subtracting fractions

Multiplying and dividing fractions
Learning objectives
Two parts to a fraction
Numerator
Denominator
3
5

Multiplying fractions
Multiply means "of"
e.g. 10 OF 3 = 30
So what is 1/2 x 2?

So what is 1/2 x 1/2?
Dividing fractions
Dividing means "in"
There are 20 halves in 10
So what is 5 1/2?

So what is 8 1/3?
.
.
.
.
This is the same as turning the fraction upside down and multiplying, which is MUCH easier to do!
To multiply fractions we multiply the top by the top (numerators)
and the bottom by the bottom (denominators)
1 1 1
2 2 4
x
Adding and subtracting fractions
Can only be done
if the denominators
are the same!
You can change all fractions to have the same denominator by finding the lowest common multiple of the denominators
Task:
Start on page 1 of your text book, Exercise 1 and 1*

Exercise 1 and then Exercise 3
Full transcript