Unit 4, Lesson 20
Make 2-Digit Numbers in Different Ways
Grade 1
Preparation
Lesson Narrative
In the previous lesson, students represented a two-digit number with tens and ones. The purpose of this lesson is for students to represent two-digit numbers with tens and ones using different combinations of tens and ones. As students reason about different ways to compose or decompose tens, they look for and make use of the base-ten structure of two-digit numbers (MP7).
In the first activity, students represent 94 with tens and ones in as many ways as they can. Students discuss how they know that they have found all of the ways to represent a number. In the second activity, students determine how many connecting cubes are in each mystery bag and how they are grouped, given clues using the number of tens and ones in each bag.
- Action and Expression
- MLR8
- Create (using words and other representations) different combinations of tens and ones that represent the same two-digit number within 100.
- Identify (orally and in writing) two-digit numbers that are represented as different combinations of tens and ones.
- Let’s make 2-digit numbers in different ways.
Required Materials
Required Preparation
None
Suggested Centers
NoneTeacher Reflection Questions
What question do you wish you had asked today? When and why should you have asked it?