2021 Oregon Math Guidance: 3.GM.C.5

 ODE and Oregon Math Project Logo

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


 Standards Statement (2021):

Recognize area as an attribute of plane figures and understand concepts of area measurement presented in authentic contexts by tiling and counting unit squares.


Preceding Pathway Content (2021)

Subsequent Pathway Content (2021)

Cross Domain Connections (2021)

Common Core (CCSS)


1.GM.A.2, 2.GM.A.3, 2.GM.B.5, 3.GM.A.2

3.GM.C.6, 3.GM.D.8



3.GM.C Crosswalk

 Standards Guidance:


  • Concept of area is measured with unit squares tiling a plane without gaps or overlaps.
    • A square with side length 1 unit, called “a unit square,” is said to have “one square unit” of area, and can be used to measure area.
    • A plane figure which can be covered without gaps or overlaps by n unit squares is said to have an area of n square units.

Teaching Strategies

  • Students should use numerical and spatial reasoning to determine the area of rectangles in contextual, mathematical problems by counting or tiling.
  • Instruction could include grade appropriate use of different measurement systems for area (e.g. in2/ft2 and cm2/m2, etc).


  • Students need to learn to conceptualize area as the amount of two dimensional space in a bounded region and to measure it by choosing a unit of area, often a square. A two-dimensional geometric figure that is covered by a certain number of squares without gaps or overlaps can be said to have an area of that number of square units. (Please reference page 17 in the Progression document).


  • A laptop cover is being made with square vinyl stickers. There are four rows of stickers. There are 9 stickers in each row. How many square stickers were used to create the laptop cover?