Math Flash Cards Numbers 0-50 with Addition & Subtraction Symbol Cards Large 4x6 inch cards, laminated for added durability, with numbers and words on the front and matching number of penguins on the back to encourage early childhood learning while having fun. 55 double-sided cards in total: Includes numbers 0-50, addition, subtraction, equal sign, greater than/less than symbols, and parent/teacher activity card. Children will be able to progress from counting the number cards to creating math formulas using the symbol cards. Bold easy-to-read numbers and words help children recognize, count, add, subtract, and read numbers. Ideal for both the classroom and home use. Unique cartoon penguins on each card keep children engaged in the learning process. Each card has an emphasized rounded top corner which makes it easy to sort and organize after each lesson.