Need to add or subtract really big numbers? Relax. PBS Math Club, the coolest homework group anywhere, has a “cheat code” to help. 

http://www.youtube.com/watch?v=v7bIWcrrW_s

Need to add or subtract really big numbers? Relax. PBS Math Club, the coolest homework group anywhere, has a “cheat code” to help. 

http://www.youtube.com/watch?v=v7bIWcrrW_s

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