It looks like a simple math sum but has left people scratching their heads... can you solve it?

It looks simple at first, but this math problem has the internet stumped. Don't be fooled - it demands more brainpower than ...
Jordan & Salish Matter on MSN

Human calculator vs 10 math whizzes

In this video, watch as 10 people face off against a Human Calculator, demonstrating remarkable mental math skills and ...