Step 1. Set up the long addition.
1 0
1 1 0
_____
Step 2. Calculate 0 + 0, which is 0.
1 0
1 1 0
_____
0
Step 3. Calculate 1 + 1, which is 2.
1 0
1 1 0
_____
2 0
Step 4. Calculate 0 + 1, which is 1.
1 0
1 1 0
_____
1 2 0
Step 5. Therefore, 10 + 110 = 120.
120
Done!