Main post link -> http://mathfights.com/
A nice website that I have found: http://mathfights.com/
It lets you battle against other mathfighters in real-time, with a 3-minute time limit to solve problems. The problems are initially very very easy, but once you battle your way to division 1, they get harder.
Easy Math Editor
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Comments
Sorry AkshajK, bobthesmartypants beat you by 1 week, 4 days.
There are many cheaters in that site. Some can answer a question with long solution in one second.