3-D shapes (age 5+)
Analyse and compare 2-D and 3-D shapes using informal language to describe sides, vertices, and other attributes
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3-D shapes (age 5+) means comparing flat 2-D and solid 3-D shapes with everyday words for faces, corners/vertices, and curves. We will sort flat vs solid, describe two solids, then check a fresh object.
Spend about 12 minutes comparing 2-D and 3-D shapes with informal attributes, then checking a new object.
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Practice this concept
Start practice3-D shapes practice
Compare 2-D and 3-D with everyday attributes.
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Learning resources
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Illustrative Mathematics · Practice link — not the full lesson
Christo’s Building
Before you open · source notes
Christo’s Building supports noticing 3-D shapes in a built structure. Not every 2-D polygon sorting game.
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 name 3-D shapes they see in the building and one face on each.
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 2026-11-12 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. “Christo’s Building.” 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 sides and corners of a shape
- Compare a triangle and a rectangle by number of sides
- Describe a cube as having 'square faces' and 'corners'
“Can your child describe what makes two shapes different — for example, explaining that a triangle has 3 corners and 3 sides while a square has 4 of each?”
Curriculum record
- Type
- Conceptual
- Subject
- Mathematics
- Domain
- Geometry
- Age range
- Ages 4–6
Standards