Unit 7 Contents

Sara solved a new problem, 536 − 218, like this:

2. 1. Explain why Sara wrote 4 above the 5 and wrote 16 above the 6 in the problem below.
   
   2. Sara continued the problem. Explain why she wrote 6 above the 7 and wrote 14 above the 4.
   
3. Solve the following problems using Sara's method.
1. 
2. 
3. 
4. 
5. 
6. 

Use Johnny's Paper-and-Pencil Subtraction in the Student Activity Book to practice Sara's method.