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Pack of 5 card decks. Each card deck contains a set of durable, laminated cards. They can be used with the Everyday Mathematics card deck activity books or the Everyday Mathematics Games kit. The two-sided card deck is used throughout Everyday Mathematics. On one side, the cards show a number deck with 4 cards for each of the numbers 0 through 10, and 1 card for numbers 11 through 20. Numbers are printed in blue or black to easily represent positive and negative integers. The reverse sides of number cards 1-10 show fractions represented in a variety of ways.