OREGON MATH STANDARDS (2021): [3.GM]

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

  ODE and Oregon Math Project Logo

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: