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:no_upscale()/cdn.vox-cdn.com/uploads/chorus_image/image/53504317/GettyImages_630805159.0.jpg "I learned how to do math with the ancient abacus — and it changed my life - Vox")
I learned how to do math with the ancient abacus — and it changed my life - Vox
How to Use an Abacus for Basic Math Operations - EnthuZiastic
How to Use an Abacus (with Pictures) - wikiHow
Abacus Overview & Examples | How to Use an Abacus - Video & Lesson Transcript | Study.com
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