Students can use these versatile hundreds boards for everything from math games to graphing. The laminated surface allows students to correct mistakes or start a new activity with ease. Use with dry-erase markers, not included. The set of 10 double-sided laminated cards measures 11 x 11 in, printed with 1 in number squares from 1 to 100 on one side and a blank grid for patterning and graphing activities on the reverse. Ages 5+.