## 2021 Oregon Math Guidance: 3.GM.A.2

**Cluster: 3.GM.A - Reason with shapes and their attributes. **

## STANDARD: 3.GM.A.2

### Standards Statement (2021):

Partition shapes into parts with equal areas and express the area of each part as a unit fraction of the whole.

### Connections:

Preceding Pathway Content (2021) | Subsequent Pathway Content (2021) | Cross Domain Connections (2021) | Common Core (CCSS) (2010) |

2.GM.A.3 | 3.GM.C.5 | 3.NF.A.1 | 3.G.A.2 3.GM.A Crosswalk |

### Standards Guidance:

#### Progressions

- Students [continue to] develop competence in the composition and decompostion of rectangular regions, that is spatially structuring rectangular arrays. They learn to partition a rectangle into identical squares by anticipating the final structure and thus forming the array by drawing rows and columns. (Please reference page 13 in the Progression document).

#### Examples

- This could include partitioning a shape into 4 parts with equal area and describe each part as 1/4 of the area of the total shape.
- Draw lines to separate a shape into 4 parts with equal area, and describe the area of each part as 1/4 of the area of the shape.
- Illustrative Mathematics:
- Student Achievement Partners: