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Learn to do Math With Soroban a Japanese Abacus: Learn how to add, subtract, multiply, divide and find square roots with this easy to use instruction guide.: Academy, SAI Speed Math: 9781537163291:
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![Amazon.com: Standard Soroban (Abacus) / 23 Digits [43300] : Toys & Games](https://m.media-amazon.com/images/I/41nh6GcUFLL.jpg "Amazon.com: Standard Soroban (Abacus) / 23 Digits [43300] : Toys & Games")