Grades 1 & up. Help students visualize and understand place value as they build numbers from 1 - 9,999,999. Set of 70 color-coded rods teaches numeric, written and expanded forms and includes 10 rods for each place value: ones through millions. Rods snap together horizontally or vertically for maximum versatility. Includes activity guide and 9" x 12" double-sided, write-on/wipe-off activity card.