1 + 1 = 10 in binary numbers.
1 plus 1 = 2
10
2 decimal, or 10 binary.
1 plus 1 = 2
When you are working in binary arithmetic.
0=0 in binary 1=1 2=10 3=11 . . . Got it?
1 plus negative 10 is equal to -9.
1 + 10 + 20 = 31
It is not magic. While incorrect in "base ten", the eqauation is correct in binary numbers (base two). The sum 1+1=10 because the value "10" (base two) is equal to 2 in base ten.
In binary it's the equivalent of decimal 3.
This will be in binary arithmetic, i.e. base 2 arithmetic.