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Mental Math Practice (Free and Infinite!)
MathHeads | A Fun Mental Maths Game
The Mental Math Quiz - HowStuffWorks
Math Speed Test Online, Mathematics Quizzes
Human Benchmark
Math Trainer — Practice Mental Math
Mental Arithmetic Aptitude Test Training, 3 free tests! - Fibonicci
Mental Maths Tests and Games - Topmarks
Mathsnapics - quick mental arithmetic maths game - math in a …
Zippy Math