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Carl Gauss at primary school

It is not known if this story about Carl Gauss is true, but it is popular among math teachers and very funny.

Carl Gauss (1777-1855) is one of the greatest mathematicians of all times. He made significant contributions to almost every area of mathematics, physics, astronomy and statistics. Gauss showed amazing mathematical skill from an early age, and there are many stories which show how clever he could be.

Here is the story. One day his teacher who was a kind of evil, asked his class to add together all the numbers from 1 to 100, just to keep them busy. He was shocked when young Gauss, after a few seconds thought, wrote down the answer 5050. The teacher couldn't understand how his pupil had calculated the sum so quickly in his head, but the eight year old Gauss pointed out that the problem was actually quite simple.

Of course, the first move for most of the people would be to start from the beginning, and add 1 + 2 + 3 +.. and so on, in a soncecutive order, and that would a crasy long story.

Gauss had decided to add the numbers in pairs - the first and the last, the second and the second to last and so on. Note that 1+100=101, 2+99=101, 3+98=101, ..., every time the same number. So the total would be 50 lots of 101, which is 5050.

When you learn arithmetic series, you will realise that the derivation of the sum of n terms of an arithmetic series is similar to this observation.

One funny challenging problem

Find the weight of each animal. A hint - you may need to use a system of equations.

An important note: If you can solve it, and send the solution to alex.calgarytutor@gmail.com , you will get one hour of free tutoring!
This offer is valid only for grade 10 or 11 students.