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About two hundred years ago, there was a nine-years-old pupil who studied in a rural primary school in Germany. His arithmetic talent did cause his teacher much surprise while raising an arithmetic question of what was the accumulative sum of 100 figures(numbers) by means of calculation.
As to the primary three pupils, it was indeed a challenge; but soon after, one of the pupils handed in the result. It was later discovered that there was only one right answer in the class; as that was done by sorting out each figure(number) from both ends and towards centre of 100 figures(numbers) then by matching 50 pairs. Though he was raised from the poorly off as well as rural family yet with arithmetic minded he finally became a superior mathematician.
參考: Partly according to The Advanced Learner Dictionary of Current English with Chinese Translation by Oxford University Press in 1975