Build it. Fit it. Make it.

SparkClass

Put shapes together to make a new shape.

CCSS 1.G.A.2
House Challenge
Snap to grid: On
Shape Composer building board Add shapes from the palette. Drag them on the grid. Select a shape to rotate, flip, copy, or delete it.

Build the house. Tap a shape to add it.

0 Pieces
1Tap a shape
2Drag and turn
3Fill the outline

Teacher notes · compose and compare

Keep the focus on the whole and its parts. Students can build freely, match an outline, or compare two valid decompositions.

1

Start with talk

In Free Build, ask: “What did you make? Which shapes did you use?” Two triangles can make a different larger shape.

2

Compare both solutions

Load Solution A, then Solution B. The outline stays the same, but the pieces change. Ask students to name one thing that changed and one thing that stayed the same.

3

Use Check as evidence

Check uses convex polygon intersection areas and the target’s convex regions. It accepts any arrangement that exactly covers the target with no overlap and no outside area—not just the two stored solutions. Red dashed pieces need attention.

CCSS 1.G.A.2: Compose two-dimensional shapes to create a composite shape, and compose new shapes from the composite shape. The 90° turns and one-unit grid snapping keep every vertex aligned to the grid. Free Build has no target, so Check and solution buttons are intentionally unavailable there.