Do you have difficulty getting your students to retain mathematics material that you've taught them? Do you want to advance your students' skill set beyond the 'Knowledge Level'? Well, here's a solution! Spaced-repetition! Use this great resource to create flashcards that students can complete in pairs of 2-3 students on their own. An excellent way to help your students build the capacity to retain understanding! Just print the cards up on 8.5 by 11in pdf paper and make a 'hamburger fold.' This