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This is not really math, more arithmetic, but you might enjoy it nonetheless: http://www.speedsums.com http://www.speedsums.com. Definitely not a substitute for
by refrigerator 11y ago
This is not really math, more arithmetic, but you might enjoy it nonetheless: http://www.speedsums.com http://www.speedsums.com. Definitely not a substitute for actual math though - some of the other comments here are great for that.