I checked Natalie's homework and found several errors but they seemed to be careless errors.
I then reviewed with her the various rules for determing divisibility by 2,3,5,9,10. She said she understood the procedure for those calculations so I arranged an assignment for her to do independent work. I then waited in the teachers' work room until she came to get me. I checked her work and she made some errors. She missed divisibility by 10, by 3, and by 9. When I told her about her errors, she explained that she didn't use the rules to get the answers. I gave her an assignment to help reinforce the lesson.