4.NF.B.4. Apply and extend previous understandings of multiplication to multiply a fraction by a whole number.
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4.NF.B.4.a. Understand a fraction $a/b$ as a multiple of $1/b$. For example, use a visual fraction model to represent $5/4$ as the product $5 \times (1/4)$, recording the conclusion by the equation $5/4 = 5 \times (1/4).$
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