Parent Guide — K.G.B.6
Kindergarten Math · Geometry
What this standard means
Your child learns to compose simple shapes to make larger shapes.
Example: Join two triangles with full sides touching to make a rectangle (or other larger shape).
Why it matters at home
- Pattern blocks: two triangles → diamond/parallelogram
- Paper cutouts: assemble a house
- Tangram-style play (simple pieces)
- Sandwich halves: two triangles → rectangle
- Floor tiles / foam shapes puzzle play
Connected standards
- Builds on:
- `K.G.B.5` — building/drawing individual shapes first
- `K.G.B.4` — matching full sides that touch
- Connects within grade:
- `K.G.A.2` — naming the small shapes and the new larger shape
- `K.G.A.1` — composing shapes that model real objects
- Leads to:
- `1.G.A.2` — compose shapes to build composite shapes
- `1.G.A.3` — partition circles/rectangles into equal shares (related composing/partitioning)
- `K.OA.A.1` — putting together parts (parallel idea in number)
Try these together (this standard)
1. Join two congruent triangles along a full side. What new shape can you make? 2. Use four small squares to make one larger square. 3. Can you make a bigger triangle out of smaller triangles?
Problems that show the connections
1. (Uses K.G.B.4) Before joining, check that the touching sides are the same length. 2. (Uses K.G.A.2) Name each piece and the composite shape. 3. (Uses K.OA.A.3) “Two parts make a whole” — relate shape compose to number pairs (informal talk).
How you can help
- Emphasize full sides touching (not just corners poking)
- Start with two pieces, then more
- Allow trial and error — rotate pieces
- Ask “What did we make?”
- Photo successes to revisit
- Pattern blocks are ideal if you have them
Answer key
1. Often a rectangle/parallelogram/diamond 2. Larger square 3. Yes, e.g., 4 small → larger triangle (depending on pieces) 4. Sides match 5. Correct names 6. Informal parts-whole talk