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 now. One upper bead means 5,One bottom beads means 1.The beads are counted by moving them up or down towards the beam. If you move them toward the beam, you count their value. If you move away, you don't count their value. This small NIGHT rods abacus is a great calculation tools for kids to learn counting and simple computations. Size: Length 14cm width 9cm height 2cm Material: wooden frame, wooden beads,bamboo rods
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