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**Gracie, **

**While John's answer is okay, you may not have known abut prime numbers -
**

**this is a middle school question... you only need to know:**

**Least Common Denominator = least common multiple (LCM) of the 2 denominators;**

**the least multiple of 3 and 5 is 3*5 = 15 and if you want to add these fractions do this**

**(5/5)*(1/3 ) + (3/3)*(2/5) = 5/15 + 6/15 = (5 + 6)/15 = 11/15.
**

**All done, this time, but as it was a question this month,
**

**if you have any more, just ask - I live nearby in your state. /Doc Fred**