Lesson 1

The purpose of this lesson is for students to represent numbers using base-ten blocks, base-ten diagrams, expanded form, numerals, and word form.

Prior to this grade, students represented numbers within 1,000 using number names, base-ten blocks and diagrams, and expanded form. They used place value to compose and decompose numbers within 1,000.

In this lesson, students revisit these familiar representations and ways of reasoning about numbers as they work to build fluency with addition and subtraction within 1,000. The base-ten diagrams and the expanded form will continue to be used to support students throughout this unit. Give students access to base-ten blocks, in case requested.

• Create a set of cards from the blackline master for each group of 2. 

Whose ideas were shared in class today? How can you leverage each of your students’ ideas to support them in being seen and heard in tomorrow’s math class?