Natasha had $8.72. She spent $4.89 on a gift for her mother. How much money does Natasha have left?

- I gave this question to my 4th Grade class. (11 kids, one absent.) It was December, I had seen them do a variety of subtraction work. I knew that a lot of them could handle subtraction using something like the standard algorithm — though certainly not everyone — and I was wondering whether a money context would be easier or harder for them. Would you predict that $8.72 – $4.89 would be easier or harder than 872 – 489?
- What approaches would you predict kids to take for this money problem? What mistakes do you expect to see?

Take a look below, and then report back in the comments:

- Which student’s approach surprised you the most?
- Assume that you’ve got time in the curriculum to ask students to work on
*precisely*one question at the beginning of class the next day. What question would you ask to address some of the ideas you see in their work below?

**Student 1**

** Student 2**

**Student 3**

**Student 4**

**Student 5**

**Student 6**

**Student 7**

**Student 8**

**Student 9**

**Student 10**