E2.1: Use appropriate units of length to estimate, measure and compare the…
Use appropriate units of length to estimate, measure and compare the perimeters of polygons, and construct polygons with a given perimeter.
The Ontario Mathematics, Grades 1–8 outcome E2.1 (Spatial Sense) for Grade 3 says: “Use appropriate units of length to estimate, measure and compare the perimeters of polygons, and construct polygons with a given perimeter.” This Fieldbook unit teaches it hands-on, with everyday materials and a printable teacher guide and student sheet for every lesson. Official wording: Ontario Mathematics, Grades 1–8.
Fence It, Fill It: Area and Perimeter Grades 3–4
Which mat is really the biggest? Does the same fence always hold the same garden? Can the same rug need more edging? Four lessons where students tile, stretch rope and chalk the schoolyard to find out that area and perimeter measure different things.
- Does the same fence always hold the same garden? 50–60 min
Teams stretch the same 12 m rope loop into different rectangles in the schoolyard and find that a fence of the same length can hold 5, 8 or 9 square metres. Students find perimeter by adding the sides, find area by multiplying, and recommend a shape for a school garden.
- How much turf for an L-shaped playground? 50–60 min
Teams chalk a real L-shaped playground in the schoolyard, split it into rectangles to find its area, and discover that cutting a corner off a rectangle takes away area but leaves the perimeter exactly the same. Then they design their own playground to a set of criteria.
Printable practice for E2.1
- Fence It, Fill It: Area and Perimeter workbook included with the unit
3 English-support pages, 3 practice pages, 3 readings, 1 word wall, 1 unit review, 1 unit test, with answer keys.
- Grade 3 Ontario Math: Spatial Sense printable pack
2 practice pages, 1 assessment, with answer keys. Free sample.
- Grade 5 Ontario Math: Spatial Sense printable pack
1 practice page, 1 activity, 1 assessment, with answer keys. Free sample.
- Grade 3 Common Core Math: Patterns and Algebraic Thinking printable pack
1 practice page, with answer keys. Free sample.
- Grade 3 Common Core Math: Geometry and Measurement printable pack
2 practice pages, 1 assessment, with answer keys. Free sample.
- Grade 5 Common Core Math: Geometry and Measurement printable pack
1 practice page, 1 activity, 1 assessment, with answer keys. Free sample.
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Compared with Common Core: 3.MD.D.8.
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