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Abacus Adventure Free
• Best mental arithmetic calculation apps.36+49-26 = ? Can you do the math above in few seconds? By using the abacus mental method, all the people can …
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Abacus For iPhone - A Simple Soroban Abacus
A simple soroban abacus that also shows the number representing the value of each column.An abacus is a tool that has been used since ancient times to …
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