Impressive kids solve math calculations shaking their fingers in the air

These Indian kids don't need a calculator to solve mathematical operations in just seconds. They do it all in their heads using a mental abacus—an old Asian technique that allows them to visualize an imaginary abacus and operate it to perform the calculations.

This video explains how it works—just don't pay attention to the exaggerated marketing statements:

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i don't want this sound cruel or insensitive, but if I saw my kid doing that I'd think he's having a stroke or severe parkinson's... still mind blowing to see this