Cheat sheet with divisibility rules for 2, 3, 4, 5, 6, 9, 10, 12, and 15. Two different levels, one meant for lower-level learners who need more detail, and one meant for higher-level learners which is more compacted. Lower-level cheat sheet includes the rule, sentence starters, an example, and a non-example for each rule and fits on two pages. The higher-level cheat sheet includes the rule and an example but fits on one page.