A. The technical field to which the invention described in the claims belongs.;The present invention relates to abacus used to prevent dementia and to develop children's emotional index.;The technical problem to be solved by the invention;;The present invention has been devised for the purpose of using the left finger by improving the conventional abacus that is mainly to use the right finger to be used for intelligence development and prevention of senile dementia.;C. Summary of the solution of the design;In the present invention, the left third of the abacus (1) as the first digit (2), the number of digits that grow from left to right and the digits that grow from right to left on the abacus border (4) on the top of the five-value display egg (3) It is configured to continuously display in Arabic numerals (5) for each digit, so that you can calculate by flipping the abacus eggs to the right using the left finger.;D. Significant Uses of Proposal;The present invention is used not only for general calculation but also for intelligent development of children and prevention of senile dementia.
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