1+1=10 10+10=100 Then, what is the answer for:

It is the binary system:

1+1 = 10                                        dez.  1+1=2

10 +10 = 100                                  dez.  2+2=4

1.)  1 + 10 = 11                               dez   1+2=3

2.)  10 + 110 = 1000                        dez   2+6=8

Good thinking Radix