Subtraction Bingo Games let students practice one-digit and two-digit subtraction for 0 to 20. Games offer flexible difficulty for increasing skill. Unique, six-way format adapts to a variety of skill levels, and is a fun learning supplement for small groups or the entire class. Also ideal for learners with disabilities and anyone learning English. Set includes 36 playing cards, more than 250 chips, caller's mat and cards, and a sturdy storage box. Bingo games are designed for teaching students in first-grade to third-grade (ages 6 to 9).