We look at the division of 13931309 by 405 
Let's see how many times 405 fits into 13931309.

On to step 1:
The number 405 fits into 1 0 times, leaving a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Bring next digit (3) of the dividend behind the 1 and repeat the process: 13 / 405

On to step 2:
13 divided by 405 is 0 with a remainder of 13.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 13 and we're left with 13.
Fetch the next digit (9) from the dividend, attach it to 13 and continue: 139 / 405

On to step 3:
The number 405 fits into 139 0 times, leaving a remainder of 139.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 139, we get 139.
Include the next digit (3) from the dividend after 139, then repeat: 1393 / 405

On to step 4:
If we divide 1393 by 405, we get 3 and a remainder of 178.
Use 3 as the next digit of our solution. 
Result so far: 3.0
The remainder is 178 after subtracting 1215 from 1393.
Fetch the next digit (1) from the dividend, attach it to 178 and continue: 1781 / 405

Moving on to step 5:
405 can be fit into 1781 4 times, resulting in a remainder of 161.
Write down 4 as next digit of the result. 
Result so far: 34.0
Subtract 1620 from 1781 to get 161.
Take the next digit (3) from the dividend and append it to 161, then repeat: 1613 / 405

On to step 6:
When dividing 1613 by 405, we get 3 with a remainder of 398.
Record the quotient 3 as the next digit in the result. 
Result so far: 343.0
Deduct 1215 from 1613 and we're left with 398.
Grab the next digit (0) from the dividend, add it to 398, then carry on: 3980 / 405

Going ahead to step 7:
405 goes into 3980 9 times with a remainder of 335.
Record the quotient 9 as the next digit in the result. 
Result so far: 3439.0
If we take 3645 away from 3980, we end up with 335.
Grab the next digit (9) from the dividend, add it to 335, then carry on: 3359 / 405

Advancing to step 8:
405 can be fit into 3359 8 times, resulting in a remainder of 119.
Write down 8 as next digit of the result. 
Result so far: 34398.0
Deduct 3240 from 3359 and we're left with 119.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1190, and continue the process.

Step 9:
When dividing 1190 by 405, we get 2 with a remainder of 380.
Put 2 as the next digit of the answer. 
Result so far: 34398.2
Deduct 810 from 1190 and we're left with 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

Moving on to step 10:
If we divide 3800 by 405, we get 9 and a remainder of 155.
Write down 9 as next digit of the result. 
Result so far: 34398.29
Deduct 3645 from 3800 and we're left with 155.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1550, and continue the process.

Let's proceed to step 11:
405 goes into 1550 3 times with a remainder of 335.
Put 3 as the next digit of the answer. 
Result so far: 34398.293
If we take 1215 away from 1550, we end up with 335.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3350, and continue the process.

Step 12:
If we divide 3350 by 405, we get 8 and a remainder of 110.
The next digit of our result is 8. 
Result so far: 34398.2938
Subtracting 3240 from 3350 leaves us with 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Advancing to step 13:
When dividing 1100 by 405, we get 2 with a remainder of 290.
Use 2 as the next digit of our solution. 
Result so far: 34398.29382
The remainder is 290 after subtracting 810 from 1100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Going ahead to step 14:
405 goes into 2900 7 times with a remainder of 65.
The next digit of our result is 7. 
Result so far: 34398.293827
If we subtract 2835 from 2900, we get 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Step 15:
405 can be fit into 650 1 times, resulting in a remainder of 245.
The next digit of our result is 1. 
Result so far: 34398.2938271
Subtracting 405 from 650 leaves us with 245.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2450, and continue the process.

Advancing to step 16:
2450 divided by 405 is 6 with a remainder of 20.
The next digit of our result is 6. 
Result so far: 34398.29382716
Subtract 2430 from 2450 to 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.

After the division, we end up with 34398.29382716 and a remainder of 2e-08.