13 Questions Fractions: Adding Fractions with Unlike Denominators – MATH Add fractions with unlike denominators by replacing given fractions with equivalent fractions to produce an equivalent sum of fractions with like denominators. Create like denominators, and then add. 9/10 5/7 4/10 13/10 Create like denominators, and then add. 9/6 7/9 10/18 15/12 Create like denominators, and then add. 4/9 23/14 3/14 2/21 … and 10 more awesome questions! Check them out by clicking “Play”.