At the age of seven, little Gauss went to primary school. The teacher's name is Butner, and he is a famous local mathematician. This young teacher from the city always thinks that children in the countryside are idiots and their talents can't be displayed. In a math class in grade three, Butner lost his temper with the children again, and then wrote a long list of formulas on the blackboard: 81297+81495+81693+…+100701+69.

"wow! How many figures are there in total? How to calculate? " The more nervous the students are, the more they can't figure out how to calculate. Butner is very proud. He knew that the last number was 100, which was larger than the previous number 198. Even if these naughty students do their calculations obediently all morning, they won't work out the results. Unexpectedly, in a short time, Gao Xiaosi came over with a small slate with the answer written on it and said, "Teacher, I have finished the calculation." Without looking up, Butner said angrily, "Go, don't be ridiculous. Anyone who wants to scribble numbers must be careful! " Say that finish, waved a hammer fist. But little gauss insisted on not leaving and said, "teacher, I'm not kidding." And gently put the small slate on the platform. Butner took one look and was too surprised to speak. Unexpectedly, this 10-year-old child worked out the correct answer so quickly. It turned out that little Gauss did not add one by one like other children, but observed carefully, used his head and found the law. He found that the sum of two numbers at the beginning and the end of a figure is the sum of 182 196,50, and182196 can be quickly calculated by multiplication. Little Gauss's incredible mathematical talent made Butner admire and feel guilty. From then on, he never looked down on children from poor families. He bought many math books for little Gauss and asked his young assistant Battier to help little Gauss learn math.