Unit 7: Numeracy skills
Fractions
Adding Fractions: 2
Sometimes the denominators are not multiples of each other, for example:
In this case we can make 12 the common denominator using
1 |
= |
1 |
x |
3 |
= |
|
3 |
|
2 |
= |
2 |
x |
4 |
= |
|
8 |
- |
|
- |
- |
|
------ |
- |
|
- |
|
- |
|
----- |
4 |
|
3 |
|
3 |
|
1 |
2 |
|
3 |
|
3 |
|
4 |
|
1 |
2 |
We can then add these two fractions directly:
1 |
+ |
2 |
= |
|
3 |
+ |
|
8 |
= |
3 |
+ |
8 |
= |
1 |
1 |
- |
|
- |
--- |
|
---- |
|
---------- |
|
----- |
4 |
|
3 |
|
1 |
2 |
|
1 |
2 |
|
|
1 |
2 |
|
1 |
2 |
Another example:
2 |
= |
2 |
x |
6 |
= |
1 |
2 |
|
1 |
= |
1 |
x |
5 |
= |
|
5 |
- |
|
- |
- |
|
------ |
- |
|
- |
|
- |
|
----- |
5 |
|
5 |
|
6 |
|
3 |
0 |
|
6 |
|
6 |
|
5 |
|
3 |
0 |
2 |
+ |
1 |
= |
1 |
2 |
+ |
|
5 |
= |
1 |
2 |
+ |
5 |
= |
1 |
7 |
- |
|
- |
--- |
|
---- |
|
------------ |
|
---- |
5 |
|
6 |
|
3 |
0 |
|
3 |
0 |
|
|
3 |
0 |
|
|
3 |
0 |

SMILE - Numeracy skills by Tom Frank, Eric Williams and Clare Wright, University of Birmingham Careers Centre adapted by Marion Kelt Glasgow Caledonian University is licensed under a Creative Commons Attribution 3.0 Unported License.