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Ontario · Ontario Math · Grade 3

E2.8: Use appropriate non-standard units to measure area, and explain how…

Use appropriate non-standard units to measure area, and explain how gaps and overlaps affect accuracy (sticky-note tiles).

The Ontario Mathematics, Grades 1–8 outcome E2.8 (Spatial Sense) for Grade 3 says: “Use appropriate non-standard units to measure area, and explain how gaps and overlaps affect accuracy (sticky-note tiles).” 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.

  • Which mat is the biggest? 50–60 min

    Teams cover three taped mats with sticky notes and find that the long, thin mat that looks biggest is the same size as a small square one. Students explain area as the number of unit squares that cover a shape, and find it faster by multiplying rows by columns.

Printable practice for E2.8

These pages practise a closely related idea; the match to E2.8 is partial.

Need just this outcome? Build a custom pack from these pages, with its answer key, in about a minute. Custom packs come with All-access and school licences.

Compared with Common Core: 3.MD.C.6 (partial).

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