Dimensions: A Study in Area and Perimeter
Subjects:
Math, Geometry, Measurement
Resource:
Other, Printable
Grades:
3
4
5
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290.15 KB PDF file - 15 page(s)
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I have been working with an adopted curriculum that is far too abstract for my students and so I have been creating materials for whole group and small group lessons.  There are enough options here for math centers as well.  Included in this unit are worksheets for squares and rectangles, dimension cards on 1 inch grid paper, and an answer key.

I started these lessons with cutting construction paper squares and rectangles in these dimensions: 1 X 1, 2 X 2, 3 X 3, 4 X 4, 5 X 5, 6 X 6, 1 X 2, 2 X 3, 2 X 4, 3 X 4, 3 X 6, and 4 X 6.  I demonstrated drawing and cutting the diagonal and measuring the sides.  We talked about the formulas for area and perimeter for rectangles, triangles, and parallelograms as we created the other shapes on the worksheets.  I emphasized that the area would be the same for all the shapes except the half triangle.  (This was a tough idea for a lot of my students.  It was not intuitive that even though I cut and reassembled the paper, the amount would not change.)

I have created the same dimensions with 1 inch grid paper to extend the experience.  I recommend having students measure the diagonals in inches with a ruler.  Students see the diagonals of squares as equal to the sides.  They need experiences to see this isn’t true.

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