Fractions & Percentages Worksheet With Answer Key Page 6
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16Fractions & Percentages
Method 2 (cross multiplication)
(
) (
)
1
3
1
10
3
5
10
15
25
1
×
+
×
+
+
=
=
=
=
5
10
5
10
50
50
2
×
Subtracting fractions
The process of subtracting fractions is very similar to adding fractions.
o When the denominators are the same
a
c
a
c
−
−
=
b
b
b
5
3
5
3
2
−
Example:
−
=
=
11
11
11
11
o When the denominators are different
Either find an equivalent fraction so that both fractions have the
same denominator or use the process of cross multiplication:
a
c
ad
cb
−
−
=
b
d
bd
3
2
Example:
−
4
7
Have to use the process of cross multiplication:
(
) (
)
3
2
3
7
2
4
21
8
13
×
−
×
−
−
=
=
=
(
)
4
7
4
7
28
28
×
Multiplying fractions
a
c
ac
×
=
b
d
bd
3
1
3
1
3
×
Example:
×
=
=
5
4
5
4
20
×
6
Dr. Mundeep Gill
Effective Learning Advice Service
elas@brunel.ac.uk
LC019
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