Illustrative Mathematics

Level A
Unit: Numbers and Operations and Algebraic Thinking
Key Lesson 1.4.9 Represent Two-Digit Numbers

Lesson topic: Two-digit numbers

Instructor Materials

Teacher Guide
Slides
Level A Centers: Check it Off stages 1-3, Grab and Count stage 2, Shake and Spill stages 3-5
CCRS Standard: 1.NBT.2, 1.NBT.4, 1.NBT.6, 1.OA.5, 1.OA.6
Learning goal: Represent the base-ten structure of two-digit numbers with drawings, words, and addition expressions.
1.4 Assessment and Practice Problems

Student Materials

Student tasks

Related Lessons

Preparation

If students need additional lessons before this key lesson, use these supplemental lessons.
- 1.4.7 Numbers With Tens and Ones
- 1.4.8 Different Representations of Tens and Ones
Review and Extend

Use these supplemental lessons if needed after teaching this key lesson.
- 1.4.10 Write Two-Digit Numbers

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