Sum of  

3/15

and

12/15

in Simplest Form

Given:   +
Since the denominators are common (the same), we can add the numerators:
+ = = However,    is NOT in Simplest Form since the Greatest Common Factor of 15 and 15 does not equal 1, GCF(15, 15) ≠ 1
Upon inspection, the GCF(15, 15) = 15In Simplest Form,   = = = 1
Therefore, the Sum of  

3/15

and

12/15

is equal to 1 in Simplest Form:  

3/15

+

12/15

= 1