I created a student cheat sheet for divisibility rules today. You can find it in my TPT (teachers pay teachers) store here.
I am using student notebooks in math class and this will make a great entry for them. My students love using their student notebooks to remind them how to complete different math operations. I happen to be a HUGE believer in anchor charts (documenting learning in general) having a
crutch place to remind yourself how to do things, etc. The student notebooks came from Runde's Room and you can find it on her TPT page here. I have tweaked some of the entries to fit the needs of my students, but the product came from her!
Have a great day! :)