This Calculation Frame has 2 sides with "adds" on one side and "minus" on the other. It has 10 levels of calculation beads to help teach and learn simple calculations of add and minus. Above the number bar at the bottom are correspondence numbers of beads which allow learner to learn about numbers. Abacus beads also train learner's hand eye coordinations and bright colours made learning maths fun. This set is suitable for children above 3 years old and a safe toy for kids to play with.