Teach a variety of topics including graphing, operations, fractions, and decimals. Include 8 array transparencies and 8 double-sided array cards. Simply lay the transparencies over the cards to build over 35 unique grids. The write-on/wipe-off border allows teachers and students to model their problem-solving techniques. Set of 4 Student Grids, each with 16 write-on/wipe-off grid overlays and a Getting Started Activity Guide. Ages 6+.