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JAPANESE ABACUS: HOW TO CALCULATE FASTER-more than 8000 arithmetic operations - for kids and adult - addition and subtraction :simple addition subtraction-small friends 5 -big friends 10 -combination , NADIA, OUAMER - Amazon.com
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Let's Learn Abacus Book 1B: Luk, Yim Lau, Fung, Cheuk Yue: 9781536879438: Books: Amazon.com
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Amazon - Abacus Mind Math Instruction Book Level 3: Step by Step Guide to Excel at Mind Math with Soroban, a Japanese Abacus (Volume 3): Academy, SAI Speed Math: 9781941589069: Books
Goldman Sachs ABACUS Deal (German Edition): Zillinger, Wolfgang: 9783656921578: Amazon.com: Books
Amazon - Abacus Mind Math Instruction Book Level 3: Step by Step Guide to Excel at Mind Math with Soroban, a Japanese Abacus (Volume 3): Academy, SAI Speed Math: 9781941589069: Books
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Amazon - Abacus Mind Math Instruction Book Level 3: Step by Step Guide to Excel at Mind Math with Soroban, a Japanese Abacus (Volume 3): Academy, SAI Speed Math: 9781941589069: Books
