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Common Core Mathematics 3-5 
 ClusterBuild fractions from unit fractions by applying and extending previous understandings of operations on whole numbers.
TopicNumber and Operations-Fractions
   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.)