First you have to find a common denominator by multiply, like 3/6 would be 6x4=24. Then you have to find a your numerator by multiplying by the same number like 3x4=12 (see how 4 is the same). Do that with both numbers then add the together, but the denominator is the same you are only adding the numerator. Like, 1/6 + 3/6 = 4/6. :)