Measuring Perimeters
Measure the perimeter of simple 2-D shapes
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Measuring Perimeters means finding the distance around a simple 2-D shape by measuring each side and adding the lengths. Perimeter is the fence around the shape, not the space inside. We will measure one rectangle, add the sides, then check a fresh shape.
Spend about 12 minutes measuring perimeters of simple paper shapes by recording side lengths and totals, then checking a new shape.
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Learning resources
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Illustrative Mathematics · Practice link — not the full lesson
Rectangle Perimeter 1
Before you open · source notes
Rectangle Perimeter 1 supports measuring and expressing perimeter. Not every area formula.
Free, no sign-in. A teacher solution is on the same page, so use the student view with your child.
Before you openAsk the learner to find a rectangle perimeter and say what was added.
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Source, access and review notes
Public Illustrative Mathematics task page. The .html address responds HTTP 308 to this URL. An anonymous GET of this URL on 2026-11-12 returned HTTP 200 with no login or payment prompt. Where a teacher solution is present, it is on the same page as the student task; this check did not find a separate locked student view. An adult can use the student view section and should not read a solution aloud. Advertising was not observed in the fetched HTML text; that is not a browser, device, or ad-free guarantee. This is a paper or discussion task, not an automatically marked interactive game. Opening the link does not save practice or assess mastery. Diagrams on the page use missing or filename-only alt text, so they are not an accessible image equivalent. Accessibility still depends on an adult describing the picture.
Illustrative Mathematics. “Rectangle Perimeter 1.” Licensed CC BY-NC-SA 4.0. External task; Gakuva does not copy, host, embed, or redistribute it.
CC BY-NC-SA 4.0 — link only
Check understanding
- Measure each side of a rectangle and add the lengths to find the perimeter
- Calculate the perimeter of a regular shape given the side length
- Explain that perimeter is the total distance around a shape
“If your child wants to put a decorative border around a rectangular picture frame 20 cm wide and 30 cm tall, can they work out the total length of border needed?”
Curriculum record
- Type
- Procedural
- Subject
- Mathematics
- Domain
- Measurement
- Age range
- Ages 7–10
Standards