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 × 1/4, recording the conclusion by the equation 5/4 = 5 x 1/4.
Khan Academy ResourcesMultiply fractions and whole numbers on the number lineMultiply unit fractions and whole numbersMultiply fractions and whole numbers with fraction modelsFractions of different wholesEquivalent whole number and fraction multiplication expressions Multiply fractions and whole numbersMultiply mixed numbers and whole numbersComparing fractions of different wholes 1Multiplying unit fractions and whole numbers Fraction multiplication on the number lineComparing fractions of different wholes Multiplying mixed numbers by whole numbers

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