Free St. Patrick's Day Math Activities for Grades K-8 Bonus St. Patrick's Day Math Activities Here are 5 more bonus St. Patrick's Day math activities for kids: 1.) Multiplication tables work like a Bingo board, where the value of each box represents the product of its corresponding row and column. Rainbow = 0 Green Hat = 1 Leprechaun = 2 Heart = 4 Pot of Gold = 0 Shamrock = 5