Add sums to 20. Flexible difficulty level 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, over 200 chips, caller's mat and cards, and a sturdy storage box. Ideal for teaching: Grades 1-3, ages 6 to 9.