Problem / game
First name
Rory Russell
School
Stamford School
Country
Age
13
Every number in the mathematical universe can be made with consecutive numbers PROVIDED that negative numbers are permitted. Think of a number you're trying to make with consecutive numbers as x. Now take one from x to make x-1. If you take 2(x-1) away from you end up with -x+2. Now take all the numbers from x-1 to -x+2. If you add all these numbers together you get 0. Then add x
e.g. 8-1=7
2x7=14
7-14=-7
-7+-6+-5+-4+-3+-2+-1+0+1+2+3+4+5+6+7=0 0+8=8