French mental calculation prodigy finds the 13th root of a 200-digit number in 70.2 seconds (Photo)

December 12th, Beijing Time, reported by the British Daily Mail: If the answer to a math problem is 407,899,893,032,210, then this problem must be very difficult. However, for Alexis Lemaire, a math prodigy from France, it's a piece of cake. He can find the answer without computer assistance, paper or pen - only using mental arithmetic.

On December 10th, this math genius faced such a challenge: On that day, a computer randomly selected a 200-digit number, and Alexis was tasked with calculating the 13th root of this long string of numbers. There are 393 trillion possible answers. To most people, finding the correct one among them would be like looking for a needle in the ocean. But Alexis didn't think so. Just 70.2 seconds later, he mentally calculated the 13th root of this 200-digit number, officially becoming the world's fastest "human computer" in terms of calculation speed.