Fact fluency is an essential element of math learning. Engage and motivate your students to learn facts from 1-20 by playing Addition Bingo 1-20 Spring Flower Math Game Activity 1st,2nd, 3rd, 4th Grade AND Subtraction Bingo 1-20 Spring Flower Math Game Activity 1st,2nd,3rd,4th Grade. The bingo games are great for when you have some extra time to fill or for when you have a substitute teacher.Each game has 30 different game boards, with lots of caller cards with a variety of facts. Addition bin