Unit 7, Lesson 2
Características de los triángulos y los cuadriláteros
Grado 3
Preparation
Lesson Purpose
The purpose of this lesson is for students to use attributes of triangles and quadrilaterals to sort them into more specific categories.
Lesson Narrative
In the previous lesson, students learned that shapes could be sorted into more than one category depending on the attributes being considered. In this lesson, they learn that shapes with the same number of sides can be further sorted into subgroups based on other attributes. As students sort triangles and quadrilaterals into subgroups, they focus on attributes other than the number of sides, such as the length of the sides or the number of angles. Throughout the lesson, if students have trouble determining if sides have the same length, offer rulers to measure the side lengths.
The cards in this lesson will be used again in centers.
- Representation
- MLR2
- Comprehend (in spoken language) the phrases “equal side lengths” or “equal sides” refer to 2 or more sides with the same length measurement.
- Describe (orally) the attributes of subcategories of triangles and quadrilaterals.
- Clasifiquemos figuras en categorías más específicas.
Required Materials
Activity 2
Required Preparation
Activity 1
- Create a set of cards from the blackline master for each group of 2 or 4.
- When copying the card sort triangles, use colored paper to distinguish these cards from the cards in the next activity.
Activity 2
- Create a set of cards from the blackline master for each group of 2 or 4.
- Bags or envelopes can be used to store sets of cards from this activity for use in the next lesson.
Teacher Reflection Questions
Today students sorted shapes for different attributes. What strategies for sorting the shapes did you anticipate? Which did you not anticipate?
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