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Common Core Mathematics 3-5 
 ClusterUse equivalent fractions as a strategy to add and subtract fractions.
  
TopicNumber and Operations-Fractions
   Grade 5
  5.NF.1.Add and subtract fractions with unlike denominators (including mixed numbers) by replacing given fractions with equivalent fractions in such a way as to produce an equivalent sum or difference of fractions with like denominators. For example, 2/3 + 5/4 = 8/12 + 15/12 = 23/12. (In general, a/b + c/d = (ad + bc)/bd.)