Our Take: Third graders learn the concept of whole objects (circle, squares, etc.) being broken into a certain number of equal parts, and that equal parts of a whole can be written as a fraction. First, they understand that 1/b represents one equal part out of the total number of parts. They build upon this understanding when they learn that a/b is a fraction that represents multiple equal parts out of the total number of parts. For example, if you show your students a circle broken into five equal parts, with two parts shaded, they should know that two-fifths of the circle is shaded.
These exercises can help students practice this Common Core State Standards skill.