What's a Common Denominator?

A common denominator is a common multiple of the denominators of a set of fractions.

E.g. What is the common denominator of 3 and 6 ?

= 6

Solution:

Find the Multiples :

3: 3, 6

6: 6, 12

A wee test for ye:

What is the common denominator of 11 and 12?