Parent Guide — K.G.B.4
Kindergarten Math · Geometry
What this standard means
Your child learns to analyze and compare 2D and 3D shapes using everyday language about parts and attributes: sides, vertices/“corners,” equal-length sides, and similarities/differences — across sizes and orientations.
Why it matters at home
- Compare a square cracker and a rectangle cracker: sides/corners
- Count corners on a picture frame vs. a stop-sign shape
- Feel edges of a block vs. a ball
- “Same number of sides?” game with cutouts
- Sort shapes: “has 3 corners” vs “has 4 corners”
Connected standards
- Builds on:
- `K.G.A.2` — correctly naming shapes being compared
- `K.G.A.3` — knowing whether you are comparing flat or solid shapes
- Connects within grade:
- `K.G.B.5` — building shapes with attention to parts
- `K.G.B.6` — joining shapes along full sides
- Leads to:
- `1.G.A.1` — defining attributes vs non-defining (color, orientation)
- `1.G.A.2` — compose shapes with attention to sides
- `2.G.A.1` — identify shapes by attributes more precisely
Try these together (this standard)
1. How many sides and corners does a triangle have? 2. How is a square like a rectangle? How is it different? (informal OK) 3. Compare a cube and a sphere: what feels different?
Problems that show the connections
1. (Uses K.G.A.2) Rotate a square and recount sides — still 4? 2. (Uses K.G.B.6) Join two shapes along a full side; talk about the sides that touch. 3. (Uses K.MD.A.2) Between two sticks used as sides, which is longer?
How you can help
- Prefer “corners” and “vertices” together
- Count parts by touching
- Compare same type first (two triangles), then different
- Include solids: edges, faces, curved surfaces
- Avoid formal proofs — informal language is the goal
- Draw and build to make parts visible
Answer key
1. 3 sides, 3 corners 2. Alike: 4 sides; square has equal sides (informal) 3. Cube has flat faces/edges; sphere is curved 4. Yes, still 4 5. Touching sides match 6. Longer stick identified