Effective educational tool. When studying on an abacus, math exercises are more effective because you remember more. This makes the use of abacus for children a good way to teach them how to calculate and equal, and it is widely used. The abacus is a calculation tool that has been used for centuries before adopting modern written number systems-it is still widely used by merchants, merchants and clerks all over the world. Abacus is widely used to teach children counting and mathematics-people who are proficient in abacus will almost automatically become good at mental arithmetic. This abacus has a sturdy plastic frame-its classic design makes it easy to use as a professional and educational tool. Suitable for children above the second grade. Size: 103*22*253mm