Question

Find a common denominator for the following fraction pairs

Answer 1

For a) the common denominator is 12
 and for b) the common denominator is 40 

Answer 2

A) The least common denominator is 12.  Both 4 and 3 go into 12 evenly.
b) The least common denominator is 40.  Both 5 and 8 go into 40 evenly.