Bingo is always a fun way to review! Use these 8 different bingo cards to practice the numbers 1-20 with your class. You can play this in a small group, or print off multiple copies and play with the whole class. For an extra treat I like to give my class small candies (smarties, m&ms, skittles, marshmallows, etc) to use as markers. It's very motivating if you tell them they will get to eat the candy at the end. All you need to do is print off the cards (and laminate them if you plan to reuse them). To play, simply call out random numbers from 1-20 and watch your students hunt through their cards for the right number!