These NO PREP 1st grade math worksheets give your students practice with 1st grade addition and subtraction concepts—add and subtract within 20, word problems, add and subtract 10, adding 2-digit and 1-digit, strategy work and fluency within 10—all presented in fun and engaging ways with puzzles, coloring, cryptograms, riddles, and more. The work is aligned with ALL of the 1st grade Common Core addition and subtraction standards. But wait .. don't miss out on getting this in a money-saving 1st