Practice 1-and 2-digit subtraction for 0-20. Increasing difficulty for increasing skill levels. The classic bingo game kids love best is now an even better educational tool that delivers more fun. 4x2 grid for younger students features kid-pleasing photos and incorporates new, teacher-requested learning elements. Large or small group use; 36 playing cards per set, over 200 chips, caller's mat and cards. Grades 1-3.