Do you know how to count in your mind?
Site has no doubt that, yes! However, try to solve this simple math problem - if your answer will converge with the best? Solving the puzzle, think quickly and in the mind, do not write anything, do not use a calculator. So there you go!
Take 1000. 40. Combine Combine More Combine 1000. 30. 1000. More Plus 20. Plus 1000. And plus 10.
What happened?
Answer:
5000 has turned out? Wrong. The correct answer - 4100. If you do not believe me, count on the calculator
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via factroom.ru