Shape classification hierarchy
Use the worked example and teaching sequence below to explain the reasoning before independent practice.
Use New Numbers to make another set. Choose Worksheet or Answer Key, then use the worksheet’s Print button.
Teaching Notes
Use the worked example and teaching sequence below to explain the reasoning before independent practice.
Before You Begin
- Recognize right angles and parallel sides.
Teaching Steps for Parents and Teachers
- A quadrilateral has four sides.
- Use parallel sides, equal lengths, and right angles to test each family definition.
- A shape may belong to more than one family.
Worked Examples
Is a square a rectangle?
- A rectangle has four right angles.
- A square has four right angles as well as four equal sides.
Answer: Yes
Common Mistakes and How to Help
Do not assume shape families are mutually exclusive.
Which defining properties prove the classification?
Questions to Check Understanding
- Which defining properties prove the classification?
- What in the numbers or diagram supports your answer?
Practice Advice
Work through the example together. Ask the learner to explain the first two problems, then try three independently. Review the first incorrect step before assigning more practice.
Next Practice
- Use New Numbers to practice the same skill with different values.
- If the learner needs help, return to the example and model each step before trying again.