Respuesta :

Just take any number less than 17 and add on to it.

0 + 17
1 + 16
2 + 15
3 + 14
4 + 13
5 + 12
6 + 11
7 + 10
8 + 9

Then you can go into negative numbers

-1 + 18
-2 + 19
-3 + 20 
etc...