4.NF.4a
Understand a fraction a/b as a multiple of 1/b. For example, use a visual fraction model to represent 5/4 as 5 copies of 1/4, recording the conclusion by the equation 5/4 = 5 ⋅ 1/4.
Khan Academy ResourcesMultiply fractions and whole numbers on the number lineMultiply unit fractions and whole numbersMultiply fractions and whole numbers with fraction modelsEquivalent whole number and fraction multiplication expressions Multiply fractions and whole numbersMultiply mixed numbers and whole numbersMultiplying unit fractions and whole numbers Fraction multiplication on the number lineMultiplying mixed numbers by whole numbers

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