1+2+3+4+5+6+7+8+9+99+100 is equal to. - Training Enrollment Network

1+2+3+4+5+6+7+8+9+99+100 is equal to.

This is a question asked by the first-grade math teacher of Gauss Primary School.

It is also an Olympic math problem in my fourth grade.

If you want a detailed process, it is:

1/2 (first item+last item) * Number of items =1/2 (1+100) * 50.

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