We're dividing 853239 by 12 
Let's see how many times 12 fits into 853239.

Advancing to step 1:
12 goes into 8 0 times with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Append the next digit (5) from the dividend to 8 and continue with: 85 / 12

Step 2:
12 goes into 85 7 times with a remainder of 1.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
If we subtract 84 from 85, we get 1.
Bring next digit (3) of the dividend behind the 1 and repeat the process: 13 / 12

Let's proceed to step 3:
12 goes into 13 1 times with a remainder of 1.
Record the quotient 1 as the next digit in the result. 
Result so far: 71.0
If we take 12 away from 13, we end up with 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 12

Moving on to step 4:
The number 12 fits into 12 1 times, leaving a remainder of 0.
Put 1 as the next digit of the answer. 
Result so far: 711.0
Deduct 12 from 12 and we're left with 0.
Include the next digit (3) from the dividend after 0, then repeat: 3 / 12

Let's proceed to step 5:
12 can be fit into 3 0 times, resulting in a remainder of 3.
The next digit of our result is 0. 
Result so far: 7110.0
Subtracting 0 from 3 leaves us with 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 12

On to step 6:
39 divided by 12 is 3 with a remainder of 3.
Write down 3 as next digit of the result. 
Result so far: 71103.0
If we subtract 36 from 39, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 7:
If we divide 30 by 12, we get 2 and a remainder of 6.
Put 2 as the next digit of the answer. 
Result so far: 71103.2
If we take 24 away from 30, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 8:
12 can be fit into 60 5 times, resulting in a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 71103.25
The remainder is 0 after subtracting 60 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 9:
0 divided by 12 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 71103.25
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 10:
12 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 71103.25
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 71103.25, with a leftover of 0.0.