Unit 5, Lesson 14
En la escuela (Optional)
Grado 2
Preparation
Lesson Purpose
The purpose of this lesson is for students to use what they know about place value to estimate what given numbers could represent in a school.
Lesson Narrative
This lesson is optional because it does not address any new mathematical content standards. This lesson does provide students with an opportunity to apply precursor skills of mathematical modeling (MP4).
In previous lessons, students were introduced to a hundred as a unit made up of 10 tens. They also learned that the three digits in a three-digit number represent hundreds, tens, and ones. In this lesson, students consider the magnitude of different numbers and decide what those numbers might represent in their school.
- Create (orally and in writing) examples and non-examples of collections of objects that could be represented by a given number.
- Explain (orally) estimation strategies.
- Pensemos en lo que los números pueden representar en una escuela.
Required Preparation
Activity 2
- Find out the exact number of two different items in your classroom. Try to find two items with very different quantities such as base-ten blocks and desks. Record those numbers on a class chart like this:
number It might represent: It could not represent:
Teacher Reflection Questions
Identify who has been sharing their ideas in class lately. Make a note of students whose ideas have not been shared and look for an opportunity for them to share their thinking in tomorrow’s lesson.
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