Five digits 1/4 abacus with 7 Column classic instrument with fully function 100% Well Hand Made Pocket size Easy to carry: Length 12cm Width 6cm Great tool for children to learn counting and calculationsThis small 1/4 FIVE Column abacus (CHINESE SOROBAN) only has one upper bead and five beads (1/4 abacus), use for decimal computation. It is a great calculation tools for kids to learn counting and simple computations. (From 0 to 9999999) S 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 Countries today.
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