The purpose of this lesson is for students to represent the base-ten structure of two-digit numbers with drawings, words, and addition expressions that show the value of the tens and ones.
In previous lessons, students interpreted different ways to represent a two-digit number as some tens and some ones. In this lesson, students create a collection with connecting cubes to represent a two-digit number and use what they have learned in previous lessons to represent the collection in as many ways as they can. They participate in a gallery walk in which they observe other collections, represent the collections in as many ways as they can, and compare their representations with their partner.
- Action and Expression
- Represent the base-ten structure of two-digit numbers with drawings, words, and addition expressions.
- Mostremos números de diferentes formas.
- Students’ collections from the previous activity are needed for the gallery walk.
- Gather materials from previous centers:
- Grab and Count, Stage 2
- Shake and Spill, Stages 3–5
- Check It Off, Stages 1–3
Teacher Reflection Questions
What unfinished learning or misunderstandings do your students have about representing tens and ones? How did you leverage those misconceptions in a positive way to further the understanding of the class?