We're dividing 13990871 by 921 
We want to figure out the number of times 13990871 can be divided by 921.

On to step 1:
The number 921 fits into 1 0 times, leaving a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Fetch the next digit (3) from the dividend, attach it to 1 and continue: 13 / 921

Advancing to step 2:
If we divide 13 by 921, we get 0 and a remainder of 13.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 13 after subtracting 0 from 13.
Include the next digit (9) from the dividend after 13, then repeat: 139 / 921

Advancing to step 3:
When dividing 139 by 921, we get 0 with a remainder of 139.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 139 leaves us with 139.
Include the next digit (9) from the dividend after 139, then repeat: 1399 / 921

Moving on to step 4:
If we divide 1399 by 921, we get 1 and a remainder of 478.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 921 from 1399 leaves us with 478.
Bring next digit (0) of the dividend behind the 478 and repeat the process: 4780 / 921

Step 5:
The number 921 fits into 4780 5 times, leaving a remainder of 175.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
If we take 4605 away from 4780, we end up with 175.
Grab the next digit (8) from the dividend, add it to 175, then carry on: 1758 / 921

Advancing to step 6:
The number 921 fits into 1758 1 times, leaving a remainder of 837.
Use 1 as the next digit of our solution. 
Result so far: 151.0
If we take 921 away from 1758, we end up with 837.
Bring next digit (7) of the dividend behind the 837 and repeat the process: 8377 / 921

On to step 7:
If we divide 8377 by 921, we get 9 and a remainder of 88.
Record the quotient 9 as the next digit in the result. 
Result so far: 1519.0
Deduct 8289 from 8377 and we're left with 88.
Bring next digit (1) of the dividend behind the 88 and repeat the process: 881 / 921

On to step 8:
When dividing 881 by 921, we get 0 with a remainder of 881.
Put 0 as the next digit of the answer. 
Result so far: 15190.0
Subtract 0 from 881 to get 881.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8810, and continue the process.

Going ahead to step 9:
921 can be fit into 8810 9 times, resulting in a remainder of 521.
The number 9 becomes the next digit in our result. 
Result so far: 15190.9
Subtracting 8289 from 8810 leaves us with 521.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5210, and continue the process.

Let's proceed to step 10:
When dividing 5210 by 921, we get 5 with a remainder of 605.
Put 5 as the next digit of the answer. 
Result so far: 15190.95
The remainder is 605 after subtracting 4605 from 5210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6050, and continue the process.

Let's proceed to step 11:
921 goes into 6050 6 times with a remainder of 524.
Put 6 as the next digit of the answer. 
Result so far: 15190.956
The remainder is 524 after subtracting 5526 from 6050.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5240, and continue the process.

Let's proceed to step 12:
If we divide 5240 by 921, we get 5 and a remainder of 635.
Record the quotient 5 as the next digit in the result. 
Result so far: 15190.9565
Subtracting 4605 from 5240 leaves us with 635.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6350, and continue the process.

On to step 13:
When dividing 6350 by 921, we get 6 with a remainder of 824.
The number 6 becomes the next digit in our result. 
Result so far: 15190.95656
If we take 5526 away from 6350, we end up with 824.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8240, and continue the process.

Let's proceed to step 14:
The number 921 fits into 8240 8 times, leaving a remainder of 872.
Write down 8 as next digit of the result. 
Result so far: 15190.956568
If we subtract 7368 from 8240, we get 872.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8720, and continue the process.

On to step 15:
921 can be fit into 8720 9 times, resulting in a remainder of 431.
Record the quotient 9 as the next digit in the result. 
Result so far: 15190.9565689
The remainder is 431 after subtracting 8289 from 8720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4310, and continue the process.

Advancing to step 16:
If we divide 4310 by 921, we get 4 and a remainder of 626.
Put 4 as the next digit of the answer. 
Result so far: 15190.95656894
Deduct 3684 from 4310 and we're left with 626.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6260, and continue the process.

After the division, we end up with 15190.95656894 and a remainder of 6.26e-07.