31209 ÷ 9 = 3467 R6
We're going to perform division on 31209 with 9 as the divisor.

Step 1:
9 goes into 3 0 times with a remainder of 3.
Write down 0 as next digit of of the result. 
Result so far: 0
Subtract 0 from 3 to get 3.
Bring next digit (1) of the dividend behind the 3 and repeat the process: 31 / 9

Step 2:
9 goes into 31 3 times with a remainder of 4.
Write down 3 as next digit of of the result. 
Result so far: 3
Subtract 27 from 31 to get 4.
Bring next digit (2) of the dividend behind the 4 and repeat the process: 42 / 9

Step 3:
9 goes into 42 4 times with a remainder of 6.
Write down 4 as next digit of of the result. 
Result so far: 34
Subtract 36 from 42 to get 6.
Bring next digit (0) of the dividend behind the 6 and repeat the process: 60 / 9

Step 4:
9 goes into 60 6 times with a remainder of 6.
Write down 6 as next digit of of the result. 
Result so far: 346
Subtract 54 from 60 to get 6.
Bring next digit (9) of the dividend behind the 6 and repeat the process: 69 / 9

Step 5:
9 goes into 69 7 times with a remainder of 6.
Write down 7 as next digit of of the result. 
Result so far: 3467
Subtract 63 from 69 to get 6.

The final result is 3467 with a remainder of 6.