1. Rewrite the following subtraction problem as an equivalent addition problem:

9-4=x

1. Analyze the following computation. Explain what is wrong in this case. What can you do to fix the understanding?

101

- 75

174

1. Solve the problems below using one of the subtraction strategies you learned this week, and explain why you used that strategy.

1. 13-9

1. 1,000-672