Unit 6, Lesson 1
Midamos en mitades de pulgada
Grado 3
Preparation
Lesson Narrative
In grade 2, students learned how to measure lengths to the nearest inch. They also learned how to represent fractions on the number line in the previous unit.
In this lesson, students start by using an inch ruler to measure the length of objects. As students find objects whose length is not a whole number of inches, they consider how to partition the inches to get a more precise measurement. Students then partition a ruler to show halves of an inch and use the ruler to measure lengths to the nearest half of an inch. The Lesson Synthesis introduces students to mixed numbers as numbers that combine whole numbers and fractions less than 1.
Students use the rulers they make in this lesson again in future lessons.
- Engagement
- MLR2
- Explain (orally) how to measure objects with a ruler marked with halves of an inch and express measurements to the nearest half-inch.
- Midamos la longitud de algunos objetos del salón.
Required Materials
Activity 2
Required Preparation
- Make copies and cut out the rulers from the blackline master (5 rulers per page).
- Each student needs a ruler from the previous activity.
Teacher Reflection Questions
In the last unit, students learned how to represent fractions with diagrams and number lines. In what ways did you see students applying that experience here?