I was very impressed. According to She, "I did calculate them with an imaginary abacus".
![](http://lh3.ggpht.com/_DBxyBGtfa3g/ShNcs3BoL2I/AAAAAAAABSU/V9NSzWDyrzo/s144/abacus.gif)
OK, The abacus-based mental calculation is the recipe. Generally, we learned to calculate multi-digit numbers from right to left, one digit at a time. It's a carry/serial calculation. But Her (abacus) algorithm is little different from us. It's the shift-up/parallel calculation.
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