Fractions
The top part of a fraction is called the numerator,
The bottom part is called the denominator.
1
of £20
4
2
of £35
5
5
of £18
6
One quarter → 20  4 = 5
One fifth → 35  5 = 7
Two fifths → 2  7 = £14
One sixth → 18  6 = 3
Five sixths → 5  3 = £15
To find one fourth
we divide by 4
To find two fifths
we first find one fifth
by dividing by five,
Then multiply by two.
Exercise
1.
1
of £20
5
2.
1
of £24
6
3.
2
of £20
5
4.
3
of £24
6
5.
4
of £50
5
6.
8
of £81
9
To find five sixths
we first find one sixth,
Then multiply by five.
Adding and Subtracting fractions
To add or subtract fractions, you must convert the fractions to have
a common denominator.
Example 1.
Example 2.
1
2
4 5
3
1
+
The common denominator is 20
−
1
2
The common denominator is 6
= 5 +4
=
4 3
−
6 6
=
=
1
20 20
9
20
6
Exercise
1.
1 1
+
5 5
2.
3 1
+
4 5
3.
1 1
+
2 3
4.
1 1

2 4
Answers (Fractions)
1. £4
5. £40
1.
2
5
2. £4
6. £72
2.
19
20
3. £8
3.
5
6
4.£12
4.
1
4