Make You Own Soroban Abacus

The abacus has been around for centuries as a counting tool. It has mainly been used in the East, Russia and Europe. It is versatile as you can add, subtract, multiply and divide numbers on base 10 (normal counting), 16 (for counting ounces and pounds), 20 (as the Mayans did). For more information...
By: cparedes2302

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