The purpose of this lesson is for students to interpret base-ten representations of two-digit numbers.
In previous lessons, students learned that the digit on the left of a two-digit number tells the number of tens and the digit on the right tells the number of ones.
In this lesson, students interpret three different base-ten representations: base-ten diagrams, _____ tens _____ ones, and addition expressions that represent the value of each digit. This is the first time students see expressions representing two-digit numbers other than 10 + n expressions representing teen numbers. Students match representations that show the same value.
At this time, students are not expected to write two-digit numbers, but continue to make sense of how to read and say them based on their base-ten structure. The teacher should record two-digit numbers when students say them.
Activity 1: Compare Representations of a Collection
- Interpret different base-ten representations of two-digit numbers (drawings, words, and addition expressions).
- Let’s think about how two-digit numbers can be shown.
- Create a set of cards from the blackline master for each group of 2–4.
|Activity 1||10 min|
|Activity 2||15 min|
|Activity 3||15 min|
|Lesson Synthesis||10 min|
Teacher Reflection Questions
What was the best question you asked students today? Why would you consider it the best one based on what students said or did?
Print Formatted Materials
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