It means add the two numbers together.
1 + 13 = 14
13 + 1 = 14
13
+1
14
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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
If you mean 2/5 plus 1/4 then it is 13/20
91
-1
1+12=13+15=28+2=30+29=59.