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Unit 3: 2D
Geometry
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Time Frame: 15 - 18 Days
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Math
> Grade 3 > Unit 3
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Unit Description
Students explore shape
and area through tetrominoes-arrangements
of four squares with full sides touching.
They variously use interlocking cubes, paper cutouts, and the computer
as they try to cover rectangles with their tetrominoes. In the process, they investigate patterns,
congruence, ideas about area, perimeter, and three geometric motions-slides,
flips (reflections), and turns (rotations).
In the second half of the unit, students explore area and congruence
further, using square and triangle pieces to build shapes of a given area and
perimeter.
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Enduring Understandings
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Shapes that are alike remain alike.
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There are relationships among shapes
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I can find shapes in the real world.
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Essential Questions
· How can I change a
shape and not make it different?
· How can different
shapes be alike?
· Why is it necessary to
identify shapes around me?
· Why is it important for
me to measure shapes?
· How can measuring
shapes help me?
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GLEs: 8, 11, 16, 19, 22, 23, 25, 30, 31, 32,
33, 35, 36, 37, 38, 47
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Students
will know
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Congruent
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Flip ( reflection)
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Slide (translate)
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Turn (rotate)
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Area
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Geometric figures
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Symmetry
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Tetromino
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Perimeter
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Square unit
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Dimension
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Students
will be able to
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Determine if a shape is congruent.
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Slide, flip, and turn shapes to determine if a shape is
congruent.
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Find the area of a given geometric figure.
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Write descriptions of geometric figures.
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Determine relationships among shapes.
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Use patterns to find area.
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Determine if a shape has symmetry.
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Find the perimeter.
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Show how 2 figures can have the same area, but different
perimeters.
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Assessments
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Performance Task
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Performance Task Rubric
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Assessment Task 13
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Assessment Task 14
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Assessment Task 15
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Assessment Task 16
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EDC Sample Assessment
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