Unit 4 Contents

8. Maya and Michael worked on the same problem. Here is the problem: “Show how a base-ten hopper can start at 1000 and move back 285.”
   
   
   Here is Maya's number line.
   
   
   
   Here is Michael's number line.
   
1. Whose number line is not correct? What mistake did that student make?
2. What is the difference between “moving back 10” and “moving back to 10”?

Complete the Exploring Base-Ten Hoppers pages in the
Student Activity Book.