Students will show six different ways to represent a number (base 10 blocks, three digit addition, simple and double addition and subtraction). There are nine sorting mats with a picture of a Christmas tree. Each tree has a number on the star (numbers include 10, 15, 20, 25, 30, 35, 40, 45, & 50). Students will read the information on each ornament and determine which number it represents and add the ornament to the tree. Once all of the ornaments are placed on the trees, students will record the information on each ornament on the provided record sheet.