Build fractions from unit fractions by applying and extending previous understanding of operations on whole numbers.
Apply/extend understandings of multiplication to multiply a fraction by a whole number. (4.NF.4)
b. 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 .) (4.NF.4b)
More information and the complete College and Career Readiness Standards can be found here.