Study Guide — 1.G.A.2

Compose two-dimensional shapes (rectangles, squares, trapezoids, tria…

Compose and decompose shapes to make new figures.

What this standard means

• Compose two-dimensional shapes (rectangles, squares, trapezoids, triangles, half-circles, and quarter-circles) or three-dimensional shapes (cubes, right rectangular prisms, right circular cones, and right circular cylinders) to create a composite shape, and compose new shapes from the composite shape.1
• Apply compose two-dimensional shapes (rectangles, squares, trapezoids, tria… with models and explanation
• Composes a target shape from parts

_See printable PDF for diagram._

How to use the 20 practice sets

| Sets | When to use | | --- | --- | | 1–5 | Intro — explore together, short written items | | 6–10 | Core skills — diagrams and written practice | | 11–15 | Mixed review — explain thinking | | 16–20 | Stretch — word problems and mastery tasks |

Pacing: 10–15 minutes per session.

How to practice

1. Make pictures from pattern blocks 2. Trace the parts of a composed shape 3. Fill an outline without gaps

_See printable PDF for diagram._

Common mistakes

• Gaps or overlaps when composing
• Cannot name the parts used

Review and practice tests

1. Start Review 1/10 when sets 1–3 feel comfortable. 2. Move up one review level with little help. 3. Use Practice Test 4/10–6/10 for mid-standard checks. 4. Practice Test 10/10 is the mastery bar for 1.G.A.2.

• [ ] Composes a target shape from parts
• [ ] Fills an outline without gaps
• [ ] Lists shapes used

Materials for this standard

• Practice Problems — 20 printable sets
• Review — 10 difficulty levels
• Practice Test — 10 difficulty levels
• Answer key — for parents and tutors