the great summation trick

today we went on with our problem in project maths form yesterday no pair is 50 so I did 50×100+50=5050 because there is 50 pairs that go to gather to make 100 that is way it is way its 50×100 and then you plus 50 because 50 has no pair. I also found a rule for example 1 to 10 is 55, 1 to 100 is 5050, 1 to 1000 is 500500, 1 to 10000 is 50005000, 1 to 100000 is 5000050000 and 1 to 1000000 is 500000500000 i can find a pattern.

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