Use these Plastic Base Ten manipulatives to teach math concepts value and grouping while enabling students to easily manipulate and visualize varying quantities. Set includes 100 individual units 30 rods 10 flats one cube 96 - page Base Ten Activity Blocks Book (LER0230 sold separately) and Teaching Notes. Warning: Choking Hazard - Small parts. Not for children under 3 yrs. Grades: 1 to 5. Ages: 6 to 11.