Unit 4 Contents

Using Expanded Form

“One way we showed our work when we added was to use expanded form,” said Rhonda. “We can use expanded form to show subtraction too.”

Rhonda's solution:

1. Look at Rhonda's work. Is she correct that 267 = 200 + 60 + 7? How do you know?
2. Why did Rhonda write 100 + 20 + 3 in her answer? Explain how she got each number.

John solved a problem that had trades:

1. Look at John's work. Is he correct that 356 = 300 + 50 + 6? How do you know?
2. Why did John change 300 + 50 + 6 to 200 + 140 + 16?
3. Is he correct that 356 = 200 + 140 + 16? How do you know?
4. Why did John write 100 + 60 + 9? Explain how he got each number.
10. Solve these problems using expanded form:
1. 
2. 
3.