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4.NF.B.4b

Description:
Understand a multiple of a/b as a multiple of 1/b, and use this understanding to multiply a fraction by a whole number. For example, use a visual fraction model to express 3×(2/5) as 6×(1/5), recognizing this product as 6/5. (In general, n×(a/b)=(n×a)/b.)