## 2021 Oregon Math Guidance: 3.GM.C.6

**Cluster: 3.GM.C - Geometric measurement: understand concepts of area and relate area to multiplication and to addition. **

## STANDARD: 3.GM.C.6

### Standards Statement (2021):

Measure areas by counting standard and non-standard unit squares.

### Connections:

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

2.GM.A.2, 2.GM.D.11, 3.GM.C.5 | 3.GM.C.7 | N/A | 3.MD.C.6 3.GM.C Crosswalk |

### Standards Guidance:

#### Terminology

- Standard unit squares use standard measurement units, such as square feet or square meters.
- Non-standard unit squares could be improvised unit measurements such as sticky notes or floor/countertop tiles.

#### Teaching Strategies

- Area can be counted in square cm, square m, square in, square ft, and improvised units.
- Students should use numerical and spatial reasoning to determine the area of rectangles in contextual, mathematical problems.

#### Progressions

- To begin an explicit focus on area, teachers might then ask students which of three rectangles covers the most area. Students may first solve the problem with decomposition (cutting and/or folding) and re-composition, and eventually analyses with area-units, by covering each with unit squares (tiles). (Please reference page 17 in the Progression document).

#### Examples

- Students can determine the area of the top of their desk or other rectangle outlined by tape on the desk by covering it using non-standard units, such as index cards, sticky notes, tiles, etc.
- Illustrative Mathematics:
- Student Achievement Partners: