Perfect size easy to carry: size:24x9x2CM/9.44x3.54x0.78inches(LxW). Great tool for children to learn counting and calculations. This 7 beads 13 column abacus is a great calculation tools for kids to learn counting and simple computations. The Chinese abacus usually has more than seven rods. There are two beads on each rod in the upper deck and five beads each in the bottom for both decimal and hexadecimal computation. Very efficient abacus techniques have been developed to do multiplication, division, addition, subtraction even square root and cube root operations at high speed. There are currently schools teaching students how to use it in many Asian. Blue,black,pink,yellow are choose for you. Package included:1 x Abacus.
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