Progressions for the Common Core State Standards for MathematicsProgressions for the CCSSM: Number & Operation--Fractions in Grades 3-5

Description: One of a series of documents describing the progression of a topic across several grade levels, informed both by research on children's development and by the structure of mathematics. Grade 5 students extend this reasoning to situations where it is necessary to re-express both fractions in terms of a new denominator. 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.