FREE Odd or even center Your students will have fun learning about odd and even numbers with this free center game! Players take turns selecting acorn number cards and sorting the acorn card on the correct odd or even mat. "Fun" cards are added for more excitement! My class loves using real acorns or acorn erasers to represent the numbers! Contents: cover sheet direction card acorn number cards 1-100 blank acorn cards "fun" cards odd/even sorting mats This FREEBIE is part of Gathering up Acorns! Gathering up Acorns! Have fun!