Georgia 3.GSR.7.3
The Standard
Discover and explain how area can be found by multiplying the dimensions of a rectangle.
Georgia's K-12 Mathematics Standards · Identify area as a measurable attribute of rectangles and determine the area of a rectangle presented in real-life, mathematical problems.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students cover or picture a rectangle with equal-size squares arranged in rows and columns. They multiply the number of rows by the number in each row to find area.
What Mastery Looks Like
- Students find a rectangle’s area by multiplying its side lengths. They connect the factors to rows and columns of square units and label the answer with square units.
Common Misconceptions
- Students may add the side lengths instead of multiplying, confusing area with perimeter. They may count grid lines rather than square units, or write units instead of square units.
How to Assess It
- Give students a drawing of a 6-by-4-foot rectangular garden. Ask them to find the area and explain how the rows and columns support their equation.
Lesson moves
Ways to Teach It
Give pairs square tiles to build several rectangles, record each length and width, then write multiplication equations for the areas.
Ask students to explain in writing why a 3-by-7 rectangle has the same area as a 7-by-3 rectangle.
Play Area Match with cards showing rectangles, dimensions, multiplication equations, and areas for students to pair correctly.
Have students measure a rectangular desk top in inches, calculate its area, and state how many square-inch tiles would cover it.
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Printable 3.GSR.7.3 Worksheet
A ready-to-print activity worksheet aligned to 3.GSR.7.3, with an answer key for the teacher on its own page. No account needed.
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Related Standards
- 3.GSR.7.1
Investigate area by covering the space of rectangles presented in realistic situations using multiple copies of the same unit, with no gaps or overlaps, and det...
- 3.GSR.7.2
Determine the area of rectangles (or shapes composed of rectangles) presented in relevant problems by tiling and counting.
- 5.GSR.8.4
Discover and explain how the volume of a right rectangular prism can be found by multiplying the area of the base times the height to solve authentic, mathemati...
- 3.GSR.8.2
Investigate and describe how rectangles with the same perimeter can have different areas or how rectangles with the same area can have different perimeters.
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