23851 ÷ 9 = 2650 R1
Let's divide 23851 by 9.

Step 1:
9 goes into 2 0 times with a remainder of 2.
Write down 0 as next digit of of the result. 
Result so far: 0
Subtract 0 from 2 to get 2.
Bring next digit (3) of the dividend behind the 2 and repeat the process: 23 / 9

Step 2:
9 goes into 23 2 times with a remainder of 5.
Write down 2 as next digit of of the result. 
Result so far: 2
Subtract 18 from 23 to get 5.
Bring next digit (8) of the dividend behind the 5 and repeat the process: 58 / 9

Step 3:
9 goes into 58 6 times with a remainder of 4.
Write down 6 as next digit of of the result. 
Result so far: 26
Subtract 54 from 58 to get 4.
Bring next digit (5) of the dividend behind the 4 and repeat the process: 45 / 9

Step 4:
9 goes into 45 5 times with a remainder of 0.
Write down 5 as next digit of of the result. 
Result so far: 265
Subtract 45 from 45 to get 0.
Bring next digit (1) of the dividend behind the 0 and repeat the process: 1 / 9

Step 5:
9 goes into 1 0 times with a remainder of 1.
Write down 0 as next digit of of the result. 
Result so far: 2650
Subtract 0 from 1 to get 1.

The final result is 2650 with a remainder of 1.