Plus 12 plus -13 plus plus 1 can be rewritten in mathematical terms as:
12+(-13)+1 or 12-13+1
12-13+1
=-1+1
=0
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1+12=13+15=28+2=30+29=59.
13 if you refer to a number line. If you subract you will get -1-12 = -13
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20 = 210
The sum of integers from 1 to n is n/2 times (n + 1), in this case 7.5 x 16= 120
24 + 23 + 22 + 21 + 20 + 19 + 18 + 17 + 16 + 15 + 14 + 13 + 12 + 11 + 10 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 = 300