1. Common Core State Standards
2. Math
3. Content
4. Grade 2
5. Geometry
6. Reason With Shapes And Their Attributes.

2.G.3

Partition circles and rectangles into two, three, or four equal shares, describe the shares using the words halves, thirds, half of, a third of, etc., and describe the whole as two halves, three thirds, four fourths. Recognize that equal shares of identical wholes need not have the same shape.