51805 ÷ 9 = 5756 R1
Let's divide 51805 by 9.

Step 1:
9 goes into 5 0 times with a remainder of 5.
Write down 0 as next digit of of the result. 
Result so far: 0
Subtract 0 from 5 to get 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 9

Step 2:
9 goes into 51 5 times with a remainder of 6.
Write down 5 as next digit of of the result. 
Result so far: 5
Subtract 45 from 51 to get 6.
Bring next digit (8) of the dividend behind the 6 and repeat the process: 68 / 9

Step 3:
9 goes into 68 7 times with a remainder of 5.
Write down 7 as next digit of of the result. 
Result so far: 57
Subtract 63 from 68 to get 5.
Bring next digit (0) of the dividend behind the 5 and repeat the process: 50 / 9

Step 4:
9 goes into 50 5 times with a remainder of 5.
Write down 5 as next digit of of the result. 
Result so far: 575
Subtract 45 from 50 to get 5.
Bring next digit (5) of the dividend behind the 5 and repeat the process: 55 / 9

Step 5:
9 goes into 55 6 times with a remainder of 1.
Write down 6 as next digit of of the result. 
Result so far: 5756
Subtract 54 from 55 to get 1.

The final result is 5756 with a remainder of 1.