This Problem Set is a part of the Lesson 2, Unit 1, Grade 4. In this lesson, students build the place value chart to 1 million and multiply and divide by 10 to show the relationship between units and multiple copies of units. As you move to the left, you multiply by 10; as you move to the right you divide by 10. By the end, students will multiply and divide multiple copies of two different units by 10