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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, $a/b + c/d = (ad + bc)/bd$.)


Egyptian Fractions
Mixed Numbers with Unlike Denominators
Finding Common Denominators to Add
Finding Common Denominators to Subtract
Making S'Mores
Fractions on a Line Plot