Unit 7, Lesson 7
El tamaño de un ángulo en un reloj
Grado 4
Preparation
Lesson Narrative
In this lesson, students use an analog clock as a tool to describe the size of an angle. They begin by using the clock to help describe how to draw a given angle, which involves describing the positions of the two hands of the clock. This work encourages students to relate the turning of the hands in a circular arc to the turning of rays of an angle around their shared starting point.
Students then use language that suggests rotational movement to describe and compare the sizes of angles on a clock. To describe whether an angle is greater than or less than another, they reference the amount of turn made by one or both rays. Students will connect the ideas developed in this lesson to the standard measurement of an angle (in degrees) in subsequent lessons.
- Comprehend (in spoken language) the “size of angle” as the amount of turn one ray makes from another ray that is fixed at the same starting point.
- Use the features of an analog clock to describe (orally), and compare the sizes of angles.
- Describamos ángulos usando las manecillas de un reloj.
Required Preparation
None
Teacher Reflection Questions
What questions did students have about angles or angle measurement that were addressed in this lesson? What can you do to help students refine their emerging understanding of angle measurement or resolve any questions that were not answered?