First you have to find a common denominator, in this case it's 12. Then change the fractions to equivalent fractions. 1/6= 2/12 1/4= 3/12 1/3= 4/12 Then add all the fractions up and subtract from the denominator, 12: 9/12 And finally, the remainder is 3, or 3/12. (simplified: 1/4) Hope this helps! :)