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Lesson Plan

Find the area of non-rectangular figures with partial square units by counting unit squares.

teaches Common Core State Standards CCSS.Math.Content.3.MD.C.5a
teaches Common Core State Standards CCSS.Math.Content.3.MD.C.6
teaches Common Core State Standards CCSS.Math.Content.3.MD.C.5b
teaches Common Core State Standards CCSS.Math.Practice.MP2
teaches Common Core State Standards CCSS.Math.Practice.MP6
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Big Ideas: Area is an expression of how much surface is covered. Partial units can be combined to create a whole. Areas of regular and irregular shapes can be determined by counting square units. This lesson builds on students' understanding of area as the number of square units and the size of different units. In this task, students will determine the area of non-rectangular figures by selecting appropriate units and tiling squares. Because the figures are irregular, students will reason about how to count partial squares linking to understanding fractions. Students are expected to reason that two partial pieces can create a whole, but they are not expected to know the size of the fraction. This builds toward reasoning quantitatively about the size of two-dimensional figures and using unit squares to build strategies for finding the area. Vocabulary: area square units (unit squares) appropriate unit Special Materials: Grizzly Bear Paw (Supplementary Handouts) Professional Basketball Player Hand Print (Supplementary Handouts) Professional Basketball Player Foot Print (Supplementary Handouts) grid paper (centimeter and inch) square centimeter tiles square inch tiles square foot tiles
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