We look at the division of 123391 by 35 
Let's see how many times 35 fits into 123391.

On to step 1:
The number 35 fits into 1 0 times, leaving a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 35

Let's proceed to step 2:
35 can be fit into 12 0 times, resulting in a remainder of 12.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 12, we end up with 12.
Append the next digit (3) from the dividend to 12 and continue with: 123 / 35

On to step 3:
35 can be fit into 123 3 times, resulting in a remainder of 18.
The next digit of our result is 3. 
Result so far: 3.0
Subtracting 105 from 123 leaves us with 18.
Include the next digit (3) from the dividend after 18, then repeat: 183 / 35

Moving on to step 4:
35 can be fit into 183 5 times, resulting in a remainder of 8.
The number 5 becomes the next digit in our result. 
Result so far: 35.0
The remainder is 8 after subtracting 175 from 183.
Take the next digit (9) from the dividend and append it to 8, then repeat: 89 / 35

On to step 5:
The number 35 fits into 89 2 times, leaving a remainder of 19.
The number 2 becomes the next digit in our result. 
Result so far: 352.0
Deduct 70 from 89 and we're left with 19.
Append the next digit (1) from the dividend to 19 and continue with: 191 / 35

Going ahead to step 6:
The number 35 fits into 191 5 times, leaving a remainder of 16.
Put 5 as the next digit of the answer. 
Result so far: 3525.0
If we subtract 175 from 191, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Advancing to step 7:
The number 35 fits into 160 4 times, leaving a remainder of 20.
The number 4 becomes the next digit in our result. 
Result so far: 3525.4
If we subtract 140 from 160, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 8:
35 goes into 200 5 times with a remainder of 25.
The next digit of our result is 5. 
Result so far: 3525.45
If we subtract 175 from 200, we get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Let's proceed to step 9:
35 goes into 250 7 times with a remainder of 5.
Put 7 as the next digit of the answer. 
Result so far: 3525.457
Deduct 245 from 250 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 10:
When dividing 50 by 35, we get 1 with a remainder of 15.
Use 1 as the next digit of our solution. 
Result so far: 3525.4571
Subtracting 35 from 50 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 11:
35 goes into 150 4 times with a remainder of 10.
Write down 4 as next digit of the result. 
Result so far: 3525.45714
Deduct 140 from 150 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 12:
The number 35 fits into 100 2 times, leaving a remainder of 30.
Put 2 as the next digit of the answer. 
Result so far: 3525.457142
If we take 70 away from 100, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 13:
300 divided by 35 is 8 with a remainder of 20.
Put 8 as the next digit of the answer. 
Result so far: 3525.4571428
Deduct 280 from 300 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 14:
If we divide 200 by 35, we get 5 and a remainder of 25.
The number 5 becomes the next digit in our result. 
Result so far: 3525.45714285
The remainder is 25 after subtracting 175 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

The final result is 3525.45714285 with a remainder of 2.5e-08.