Because "1" designates that you have only one of something. For example, if you have one apple, and you add another apple to that, you end up with two apples, not eleven.
10 plus 1 is 11.
1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 11 - 9,999,999 = - 9,999,978
11
11 + 1 + 0.01 + 0.11 + 0.111 = 12.231
75
Redefine "plus".
1
11 + 11 + 88 = 11*(1 + 1 + 8) = 11*(10) = 110
No it equals 2 10 plus 1 equals 11
4 + 6 + 1 = 11
4+4=8+0=8+1=9+1=10+0=10+1=11 It equals 11. You're welcome.
It is: 3/11 plus 10/11 = 13/11 or 1 and 2/11