71857 ÷ 9 = 7984 R1
Let's divide 71857 by 9.

Step 1:
9 goes into 7 0 times with a remainder of 7.
Write down 0 as next digit of of the result. 
Result so far: 0
Subtract 0 from 7 to get 7.
Bring next digit (1) of the dividend behind the 7 and repeat the process: 71 / 9

Step 2:
9 goes into 71 7 times with a remainder of 8.
Write down 7 as next digit of of the result. 
Result so far: 7
Subtract 63 from 71 to get 8.
Bring next digit (8) of the dividend behind the 8 and repeat the process: 88 / 9

Step 3:
9 goes into 88 9 times with a remainder of 7.
Write down 9 as next digit of of the result. 
Result so far: 79
Subtract 81 from 88 to get 7.
Bring next digit (5) of the dividend behind the 7 and repeat the process: 75 / 9

Step 4:
9 goes into 75 8 times with a remainder of 3.
Write down 8 as next digit of of the result. 
Result so far: 798
Subtract 72 from 75 to get 3.
Bring next digit (7) of the dividend behind the 3 and repeat the process: 37 / 9

Step 5:
9 goes into 37 4 times with a remainder of 1.
Write down 4 as next digit of of the result. 
Result so far: 7984
Subtract 36 from 37 to get 1.

The final result is 7984 with a remainder of 1.