Math Supplies For The Middle & High School Classroom. We offer a complete line of math aids, math supplies, and math equipment for the middle and high school classroom. Many of our products are exclusively produced by Geyer Instructional Products! We specialize in graph paper, graphing and measurement tools, dry erase products, and posters. We also carry books, games, and general school supplies. Everything you need to make learning fun and understandable for every student. Bring in visuals and games to grab the attention of the students. Decorate your classroom with fun and educational posters. Graphing, dry erase lapboards and graph paper are great tools for students to practice graphing.