What’s the mistake? How can you help the kid?
When you’re done with this post, go check out Mary Dooms’ blog and go follow her on twitter. Thanks for the submission, Mary!
No, Sal Khan did not actually submit this question. But Andyhav3 asks:
What’s this student getting at with “the right side of the decimal,” and how might you help Andyhav3?
[Click here to see how your approach compares to how his question was actually handled.]