Unit 7, Lesson 5
Algunos triángulos, todos los triángulos
Grado 1
Preparation
Lesson Narrative
In previous lessons, students used their own language, and continued to refine their language, as they sorted and identified shapes, including triangles, squares, rectangles, circles, and hexagons. They drew shapes, based on attributes.
In this lesson, students analyze examples and nonexamples of triangles and identify defining and nondefining attributes of triangles. Then, using dot paper, students draw different triangles. By the end of the lesson, students generalize the defining attributes of triangles to deepen their understanding of a triangle as a flat shape that has 3 straight sides and 3 corners.
- Representation
- MLR8
- Draw (orally) examples and nonexamples of triangles.
- Generalize (orally) that the term “triangle” refers to a flat shape with three straight sides and three corners.
- Descubramos qué hace que una figura sea un triángulo.
Required Materials
Activity 1
Activity 2
Activity 3
Required Preparation
- Each group of 2 students needs a set of the flat shapes cards from a previous lesson.
- Each group needs a set of the flat shapes cards from the previous activity.
Gather materials from previous centers:
- Geoblocks, Stage 3
- How Are They the Same? Stage 1
- Compare, Stage 1
- Counting Collections, Stages 1–3
Suggested Centers
NoneTeacher Reflection Questions
Think about a time you recently made a mistake during math class. How did you leverage your mistake to show students that mistakes are part of the learning process?