Common Core Mathematics 35    Cluster  Build fractions from unit fractions by applying and extending
previous understandings of operations on whole numbers.    Topic  Number and OperationsFractions 
    Grade 4     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.)    

