Study Guide — K.G.A.3
Flat vs solid shapes
Flat shapes lie on paper; solid shapes you can hold — balls, boxes, cans.
What this standard means
- Sort shapes into flat and solid
- Name examples: circle vs sphere, square vs cube
- Explain why a shape is flat or solid
- Find flat and solid shapes at home
_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. Sort pantry items: can = solid, label = flat 2. Draw flat shapes vs hold solid models 3. Use “can roll or stack?” talk
_See printable PDF for diagram._
Common mistakes
- Calling thick cutouts “solid”
- Confusing circle and sphere names
- Thinking all 3D objects are balls
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 K.G.A.3.
- [ ] Sorts flat vs solid correctly
- [ ] Gives examples of each
- [ ] Uses 2D/3D language
Materials for this standard
- Practice Problems — 20 printable sets
- Review — 10 difficulty levels
- Practice Test — 10 difficulty levels
- Answer key — for parents and tutors