We're dividing 19911868 by 399 
We want to figure out the number of times 19911868 can be divided by 399.

Going ahead to step 1:
399 goes into 1 0 times with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Include the next digit (9) from the dividend after 1, then repeat: 19 / 399

On to step 2:
399 can be fit into 19 0 times, resulting in a remainder of 19.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 19 leaves us with 19.
Append the next digit (9) from the dividend to 19 and continue with: 199 / 399

Step 3:
399 can be fit into 199 0 times, resulting in a remainder of 199.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 199 and we're left with 199.
Fetch the next digit (1) from the dividend, attach it to 199 and continue: 1991 / 399

Going ahead to step 4:
1991 divided by 399 is 4 with a remainder of 395.
Write down 4 as next digit of the result. 
Result so far: 4.0
The remainder is 395 after subtracting 1596 from 1991.
Grab the next digit (1) from the dividend, add it to 395, then carry on: 3951 / 399

Going ahead to step 5:
If we divide 3951 by 399, we get 9 and a remainder of 360.
The number 9 becomes the next digit in our result. 
Result so far: 49.0
The remainder is 360 after subtracting 3591 from 3951.
Bring next digit (8) of the dividend behind the 360 and repeat the process: 3608 / 399

Advancing to step 6:
The number 399 fits into 3608 9 times, leaving a remainder of 17.
The next digit of our result is 9. 
Result so far: 499.0
Subtract 3591 from 3608 to get 17.
Append the next digit (6) from the dividend to 17 and continue with: 176 / 399

Going ahead to step 7:
The number 399 fits into 176 0 times, leaving a remainder of 176.
Use 0 as the next digit of our solution. 
Result so far: 4990.0
The remainder is 176 after subtracting 0 from 176.
Grab the next digit (8) from the dividend, add it to 176, then carry on: 1768 / 399

Going ahead to step 8:
If we divide 1768 by 399, we get 4 and a remainder of 172.
The next digit of our result is 4. 
Result so far: 49904.0
The remainder is 172 after subtracting 1596 from 1768.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1720, and continue the process.

Moving on to step 9:
399 can be fit into 1720 4 times, resulting in a remainder of 124.
Use 4 as the next digit of our solution. 
Result so far: 49904.4
Deduct 1596 from 1720 and we're left with 124.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1240, and continue the process.

Step 10:
If we divide 1240 by 399, we get 3 and a remainder of 43.
Use 3 as the next digit of our solution. 
Result so far: 49904.43
Subtract 1197 from 1240 to get 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

On to step 11:
399 can be fit into 430 1 times, resulting in a remainder of 31.
The next digit of our result is 1. 
Result so far: 49904.431
If we subtract 399 from 430, we get 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Step 12:
399 can be fit into 310 0 times, resulting in a remainder of 310.
Put 0 as the next digit of the answer. 
Result so far: 49904.431
Deduct 0 from 310 and we're left with 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

Let's proceed to step 13:
The number 399 fits into 3100 7 times, leaving a remainder of 307.
Record the quotient 7 as the next digit in the result. 
Result so far: 49904.43107
If we take 2793 away from 3100, we end up with 307.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3070, and continue the process.

Advancing to step 14:
The number 399 fits into 3070 7 times, leaving a remainder of 277.
Use 7 as the next digit of our solution. 
Result so far: 49904.431077
Subtracting 2793 from 3070 leaves us with 277.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2770, and continue the process.

The final outcome is 49904.431077, with a leftover of 2.77e-05.