Before You Begin this Unit… 

Unit at a Glance 
Unit 7 is the only unit in Grade 3 focused on fractions. By the end of this unit students should have a strong understanding of fractions, especially how to represent them on a number line diagram. This unit builds upon multiplication and division ideas which are covered thoroughly in Unit 5. 
Suggested Dates: Estimated Duration: 25 days *Investigation 1: 6 lessons *Investigation 2: 4 lessons CMS Fractions on a Number Line Unit: 9 lessons 

Standards Addressed in the Unit  
3.NF.1 Understand a fraction 1/b as the quantity formed by 1 part when a whole is partitioned into b equal parts; understand a fraction a/b as the quantity formed by a parts of size 1/b. 3.NF.2 Understand a fraction as a number on the number line; represent fractions on a number line diagram. 3.NF.2a. Represent a fraction 1/b on a number line diagram by defining the interval from 0 to 1 as the whole and partitioning it into b equal parts. Recognize that each part has size 1/b and that the endpoint of the part based at 0 locates the number 1/b on the number line. 3.NF.3 Explain equivalence of fractions in special cases, and compare fractions by reasoning about their size. 3.NF.3a. Understand two fractions as equivalent (equal) if they are the same size, or the same point on a number line. 3.NF.3b.Recognize and generate simple equivalent fractions, e.g., 1/2 = 2/4, 4/6 = 2/3). Explain why the fractions are equivalent, e.g., by using a visual fraction model. 3.NF.3c. Express whole numbers as fractions, and recognize fractions that are equivalent to whole numbers. Examples: Express 3 in the form 3 = 3/1; recognize that 6/1 = 6; locate 4/4 and 1 at the same point of a number line diagram. 