Math games, Mathematics 7.70

Math games
Test your mind, skill and speed in the fight with time.
There are mathematical methods in just a 2 - 3 seconds multiply 11*83, 104*108, square 75, take the square root of 4489, divide 33126 by 5 and many others.
This application - a game and a guide which includes the most effective mathematical methods of mental arithmetic.
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