These 10 St. Patrick's Day logic puzzles practice adding and subtracting to 20 and are great math enrichment for 1st and 2nd grade! These March brain teasers make great math centers and activities. Fast finishers use their critical thinking skills to find the missing addends in each equation using addition and subtraction to 20. These St Patricks Day math puzzles are perfect for adding a twist to leprechaun math stations, morning work, problem of the day, or as mini math lessons in first and se