15911844 ÷ 404 
The aim is to understand the frequency of 404 in 15911844.

Advancing to step 1:
The number 404 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 subtract 0 from 1, we get 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 404

Moving on to step 2:
404 goes into 15 0 times with a remainder of 15.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 15 leaves us with 15.
Include the next digit (9) from the dividend after 15, then repeat: 159 / 404

Moving on to step 3:
404 goes into 159 0 times with a remainder of 159.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 159, we end up with 159.
Append the next digit (1) from the dividend to 159 and continue with: 1591 / 404

Going ahead to step 4:
When dividing 1591 by 404, we get 3 with a remainder of 379.
Use 3 as the next digit of our solution. 
Result so far: 3.0
The remainder is 379 after subtracting 1212 from 1591.
Fetch the next digit (1) from the dividend, attach it to 379 and continue: 3791 / 404

Moving on to step 5:
When dividing 3791 by 404, we get 9 with a remainder of 155.
Record the quotient 9 as the next digit in the result. 
Result so far: 39.0
If we take 3636 away from 3791, we end up with 155.
Include the next digit (8) from the dividend after 155, then repeat: 1558 / 404

Going ahead to step 6:
When dividing 1558 by 404, we get 3 with a remainder of 346.
Write down 3 as next digit of the result. 
Result so far: 393.0
If we subtract 1212 from 1558, we get 346.
Grab the next digit (4) from the dividend, add it to 346, then carry on: 3464 / 404

Let's proceed to step 7:
404 goes into 3464 8 times with a remainder of 232.
Put 8 as the next digit of the answer. 
Result so far: 3938.0
If we subtract 3232 from 3464, we get 232.
Fetch the next digit (4) from the dividend, attach it to 232 and continue: 2324 / 404

Moving on to step 8:
When dividing 2324 by 404, we get 5 with a remainder of 304.
Put 5 as the next digit of the answer. 
Result so far: 39385.0
Subtracting 2020 from 2324 leaves us with 304.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3040, and continue the process.

On to step 9:
404 goes into 3040 7 times with a remainder of 212.
Put 7 as the next digit of the answer. 
Result so far: 39385.7
Subtract 2828 from 3040 to get 212.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2120, and continue the process.

Going ahead to step 10:
404 can be fit into 2120 5 times, resulting in a remainder of 100.
The number 5 becomes the next digit in our result. 
Result so far: 39385.75
Subtracting 2020 from 2120 leaves us with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Step 11:
If we divide 1000 by 404, we get 2 and a remainder of 192.
The next digit of our result is 2. 
Result so far: 39385.752
The remainder is 192 after subtracting 808 from 1000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

Moving on to step 12:
If we divide 1920 by 404, we get 4 and a remainder of 304.
Record the quotient 4 as the next digit in the result. 
Result so far: 39385.7524
The remainder is 304 after subtracting 1616 from 1920.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3040, and continue the process.

Advancing to step 13:
The number 404 fits into 3040 7 times, leaving a remainder of 212.
Record the quotient 7 as the next digit in the result. 
Result so far: 39385.75247
The remainder is 212 after subtracting 2828 from 3040.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2120, and continue the process.

Going ahead to step 14:
The number 404 fits into 2120 5 times, leaving a remainder of 100.
The next digit of our result is 5. 
Result so far: 39385.752475
Subtract 2020 from 2120 to get 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Advancing to step 15:
404 goes into 1000 2 times with a remainder of 192.
Put 2 as the next digit of the answer. 
Result so far: 39385.7524752
The remainder is 192 after subtracting 808 from 1000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

Step 16:
The number 404 fits into 1920 4 times, leaving a remainder of 304.
The next digit of our result is 4. 
Result so far: 39385.75247524
Deduct 1616 from 1920 and we're left with 304.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3040, and continue the process.

The final result is 39385.75247524 with a remainder of 3.04e-07.