2-D shapes (age 6+)
Identify and describe properties of 2-D shapes including the number of sides and line symmetry in a vertical line
Lesson
Set out your lesson
Count boundary sides and test a vertical mirror line in the displayed orientation.
Before teaching
Can discuss the supplied example in an accessible mode; adapt directions without supplying the target answer.
Check the learner can follow the model with support before moving on. Source prerequisite ordering is not learner mastery; return to prerequisite work when needed.
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Teaching approaches
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1 approach
Count boundary sides and test a vertical mirror line in the displayed orientation.
Count boundary sides and test a vertical mirror line in the displayed orientation.
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Learning resources
Extra practice links — they do not replace Gakuva’s teaching approach.
Illustrative Mathematics · Practice link — not the full lesson
All vs. Only some
Before you open · source notes
Sort shape statements that are true of all shapes in a set versus only some. Supports talking about sides and properties of 2-D shapes.
Free, no sign-in. A teacher solution is on the same page, so use the student view with your child.
Before you openAsk for one property true of every shape shown and one true of only some. Adult reading helps.
Opening this link does not save learning or assess mastery.
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 2026-11-11 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. “All vs. Only some.” 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
- Count the number of sides of a given 2-D shape
- Identify whether a 2-D shape has a vertical line of symmetry
- Use properties (number of sides, symmetry) to describe and distinguish between shapes
“Can your child count the sides of a shape and say whether it has a line of symmetry — for example, knowing that a rectangle is symmetrical but a scalene triangle is not?”
Curriculum record
- Type
- Conceptual
- Subject
- Mathematics
- Domain
- Geometry
- Age range
- Ages 6–10
Standards