Watch Clip
![](http://image.pbs.org/video-assets/1K3N0gZ-asset-mezzanine-16x9-mTPLWIw.png?resize=410x)
This Teen Calculates Mind-Boggling Math in Her Head
3m 10s
Panidapu executes complex problems with mental math using the abacus method of calculation, a technique that relies on an ancient tool.