Unit 6, Lesson 3
Midamos en mitades y en cuartos de pulgada
Grado 3
Preparation
Lesson Purpose
The purpose of this lesson is for students to use what they know about fraction equivalence to measure with a ruler that is marked with halves and fourths of an inch.
Lesson Narrative
Previously, students learned to measure lengths using separate rulers that were marked with halves or fourths of an inch. Here, they use what they know about fraction equivalence to read measurements from a ruler marked with both halves and fourths of an inch. Then, students consider lengths that could be named in more than one way.
In future lessons, this ruler will be used to measure objects and represent measurements on a line plot.
- Engagement
- MLR8
- Use a ruler marked with both halves and fourths of an inch to measure objects and express measurements using equivalent fractions.
- Midamos longitudes en mitades de pulgada y en cuartos de pulgada.
Required Materials
Required Preparation
Warm-up
- Each group of 2 needs the rulers from the previous lesson.
- Cut out a ruler from the blackline master for each student.
Activity 1
- Each student needs a ruler marked with half inches and quarter inches from the Warm-up.
Activity 2
- Each student needs a ruler marked with half inches and quarter inches from the previous activity.
Teacher Reflection Questions
Think about who volunteered to share their thinking with the class today. Are the same students always volunteering, while some students never offer to share? What can you do to help the class understand the value of hearing the ideas of every mathematician?
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