Addition and Subtraction Flash Cards 0-20, Print, Cut and Learn!EVERY Addition and Subtraction fact within 20. That's over 900 individual flashcards!!! Share with families for them to print, cut, and learn with over the summer.Math fact automaticity is SO important, and will help students gain number fluency as well as prepare them for more challenging math skills as they age. Included in this resource:56 pages (8 cards/page)of horizontal flashcards (addition sums 0-20, and subtraction differenc