This Thanksgiving Themed math center is a fun way for students to practice the concept of one more, one less. Students must write the numbers that are one more and one less of the number given. This math center covers numbers 1-20. A number line is provided for additional support. 18 cards are provided. Simply print, laminate and cut out the cards. Place in a bin with an expo number and optional number line. Can be used as morning work or as a math center.