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I'm 21 and I want to learn to use an abacus. Is it too late for me, since kids are usually taught at the ages of 5-12? - Quora
How To Use An Abacus To Teach Maths For Kids?
How Long Before Children Experience Spectacular Results from Abacus Mind Math? - Learn Abacus At Home
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I learned how to do math with the ancient abacus โ and it changed my life - Vox
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