<PRE><B>Question 1039326</B>
20+21+22+23+24+25+26+27+28+29+30 = 275
:
But here is a shortcut to adding consecutive numbers:
Add the smallest number to the largest number of the given set of consecutive numbers. Then multiply the result by the number of numbers in the set. Finally divide the result by two:
:
20+30= 50 and from 20 to 30, BOTH INCLUDED, we have 11 numbers:
50*11 = 550
550/2 = 275
so there you have it.
John</PRE>