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Apply and extend previous understandings of division to divide unit fractions by whole numbers and whole numbers by unit fractions.
Apply and extend previous understandings of multiplication to multiply a fraction or whole number by a fraction.
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.)
Add and subtract mixed numbers with like denominators, e.g., by replacing each mixed number with an equivalent fraction, and/or by using properties of operations and the relationship between addition and subtraction.
Understand addition and subtraction of fractions as joining and separating parts referring to the same whole.