Let's divide 13908688 by 521
We want to figure out the number of times 13908688 can be divided by 521.

Step 1:
The number 521 fits into 1 0 times, leaving a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Take the next digit (3) from the dividend and append it to 1, then repeat: 13 / 521

Moving on to step 2:
13 divided by 521 is 0 with a remainder of 13.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 13 after subtracting 0 from 13.
Grab the next digit (9) from the dividend, add it to 13, then carry on: 139 / 521

Step 3:
The number 521 fits into 139 0 times, leaving a remainder of 139.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 139 and we're left with 139.
Bring next digit (0) of the dividend behind the 139 and repeat the process: 1390 / 521

Advancing to step 4:
The number 521 fits into 1390 2 times, leaving a remainder of 348.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Deduct 1042 from 1390 and we're left with 348.
Grab the next digit (8) from the dividend, add it to 348, then carry on: 3488 / 521

Moving on to step 5:
If we divide 3488 by 521, we get 6 and a remainder of 362.
The next digit of our result is 6. 
Result so far: 26.0
The remainder is 362 after subtracting 3126 from 3488.
Fetch the next digit (6) from the dividend, attach it to 362 and continue: 3626 / 521

On to step 6:
521 goes into 3626 6 times with a remainder of 500.
Use 6 as the next digit of our solution. 
Result so far: 266.0
The remainder is 500 after subtracting 3126 from 3626.
Include the next digit (8) from the dividend after 500, then repeat: 5008 / 521

Step 7:
5008 divided by 521 is 9 with a remainder of 319.
Record the quotient 9 as the next digit in the result. 
Result so far: 2669.0
If we take 4689 away from 5008, we end up with 319.
Fetch the next digit (8) from the dividend, attach it to 319 and continue: 3198 / 521

Let's proceed to step 8:
3198 divided by 521 is 6 with a remainder of 72.
Record the quotient 6 as the next digit in the result. 
Result so far: 26696.0
If we subtract 3126 from 3198, we get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Let's proceed to step 9:
720 divided by 521 is 1 with a remainder of 199.
The number 1 becomes the next digit in our result. 
Result so far: 26696.1
Subtracting 521 from 720 leaves us with 199.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1990, and continue the process.

Moving on to step 10:
If we divide 1990 by 521, we get 3 and a remainder of 427.
Put 3 as the next digit of the answer. 
Result so far: 26696.13
If we take 1563 away from 1990, we end up with 427.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4270, and continue the process.

Let's proceed to step 11:
If we divide 4270 by 521, we get 8 and a remainder of 102.
The number 8 becomes the next digit in our result. 
Result so far: 26696.138
If we take 4168 away from 4270, we end up with 102.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1020, and continue the process.

Step 12:
When dividing 1020 by 521, we get 1 with a remainder of 499.
Put 1 as the next digit of the answer. 
Result so far: 26696.1381
Deduct 521 from 1020 and we're left with 499.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4990, and continue the process.

Moving on to step 13:
If we divide 4990 by 521, we get 9 and a remainder of 301.
The number 9 becomes the next digit in our result. 
Result so far: 26696.13819
The remainder is 301 after subtracting 4689 from 4990.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3010, and continue the process.

Moving on to step 14:
521 can be fit into 3010 5 times, resulting in a remainder of 405.
The number 5 becomes the next digit in our result. 
Result so far: 26696.138195
If we take 2605 away from 3010, we end up with 405.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4050, and continue the process.

Moving on to step 15:
The number 521 fits into 4050 7 times, leaving a remainder of 403.
Use 7 as the next digit of our solution. 
Result so far: 26696.1381957
If we take 3647 away from 4050, we end up with 403.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4030, and continue the process.

On to step 16:
521 can be fit into 4030 7 times, resulting in a remainder of 383.
The number 7 becomes the next digit in our result. 
Result so far: 26696.13819577
Deduct 3647 from 4030 and we're left with 383.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3830, and continue the process.

The final outcome is 26696.13819577, with a leftover of 3.83e-07.