Lesson 17. Unit 6. Grade 1

This Problem Set is a part of the Lesson 17, Unit 6, Grade 1. In this lesson, students adding pairs of two-digit numbers using drawings and the vertical addition method, skills introduced in the previous two lessons.

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Lesson 11. Unit 4. Grade 1

Lesson 12. Unit 4. Grade 1

Lesson 13. Unit 3. Grade 1

Lesson 2. Unit 3. Grade 1