the teacher asked the students to add up all the numbers from 1 to 100.It only took carl a minute to come up with the answer. Can you figure what carl did to come up with the answer and what is the correct answer.Hint: there is a pattern.

Answer 1

http://www.ehow.com/how_2225976_add-numbers.html

Answer 2

100(100+1)/2= 5050