This product provides students with a self-correcting activity to work on their understanding of doubles and producing 1 more and 1 less equations for fact fluency. The material is printed front to back creating flaps to reveal answer checks and the back side reveals the answer for the doubles fact. Print - Laminate - Cut for a center work that can be used over and over. Students can practice many times to build fluency with numbers and then create their own equations for 1 more 1 less. Pg 1 In