115 R:11
Explanation:
Subtract 20 from a 23 and bring a 1 on the top. 23-20=3. Then bring a 1 down from the 2,311.
2 numbers left.
Add another 1 to the top because your subtracting 31 with 20. 31-20=11.
Then bring the 1 down again and then bring up a 5. 20x5=100.
111-100=11 and so 11 would be our remainder. What on the top would be our answer.
Final Result: 115 R:11
20| 23,11
- 20
____
31
- 20
_______
111
- 100
________
R: 11
