Use this magnetic set to create and manipulate colorful place value charts on your whiteboard or hand your students the disks for hands-on practice on lap boards too! It is an essential tool for all math series. The pieces are color-coded by place value. Grades 3–6 set includes 140 disks (20 each of 7 places: millions, hundred thousands, ten thousands, thousands, hundreds, tens, and ones) plus 7 headings. Lap boards sold separately (7200000). Disks measure 1" and headings measure 6" x 2". *Due to the weight of magnetic items, if you purchase multiple magnetic products your shipping cost may increase.*