Learn about unknown numbers with your 1st & 2nd graders using these missing addends addition magic square math puzzles! Perfect in a classroom or home school. Low prep, just print, cut & go! This fun reusable game provides hands on activities to keep students engaged while learning necessary algebra skills. Great for test prep, stations, centers, review, early & fast finishers, enrichment, GATE & critical thinking skills. {first, second, grade, homeschool, basic operations}