Number and Operations—FractionsBuild fractions from unit fractions by applying and extending previous understandings of operations on whole numbers.4Apply and extend previous understandings of multiplication to multiply a fraction by a whole number.aUnderstand 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 × (1/4).