CCSS.Math.Content.4.NF.B Build fractions from unit fractions by applying and extending previous understandings of operations on whole numbers.

• CCSS.Math.Content.4.NF.B.3
  Understand a fraction a/b with a > 1 as a sum of fractions 1/b.
• CCSS.Math.Content.4.NF.B.4
  Apply and extend previous understandings of multiplication to multiply a fraction by a whole number.