We look at the division of 18404 by 879 
The aim is to understand the frequency of 879 in 18404.

Going ahead to step 1:
879 can be fit into 1 0 times, resulting in a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Bring next digit (8) of the dividend behind the 1 and repeat the process: 18 / 879

Step 2:
The number 879 fits into 18 0 times, leaving a remainder of 18.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 18 after subtracting 0 from 18.
Bring next digit (4) of the dividend behind the 18 and repeat the process: 184 / 879

Step 3:
879 can be fit into 184 0 times, resulting in a remainder of 184.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 184 and we're left with 184.
Append the next digit (0) from the dividend to 184 and continue with: 1840 / 879

Moving on to step 4:
879 can be fit into 1840 2 times, resulting in a remainder of 82.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtract 1758 from 1840 to get 82.
Include the next digit (4) from the dividend after 82, then repeat: 824 / 879

Going ahead to step 5:
The number 879 fits into 824 0 times, leaving a remainder of 824.
Record the quotient 0 as the next digit in the result. 
Result so far: 20.0
Deduct 0 from 824 and we're left 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.

On to step 6:
If we divide 8240 by 879, we get 9 and a remainder of 329.
Record the quotient 9 as the next digit in the result. 
Result so far: 20.9
Subtract 7911 from 8240 to get 329.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3290, and continue the process.

Step 7:
If we divide 3290 by 879, we get 3 and a remainder of 653.
Put 3 as the next digit of the answer. 
Result so far: 20.93
If we subtract 2637 from 3290, we get 653.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6530, and continue the process.

On to step 8:
879 can be fit into 6530 7 times, resulting in a remainder of 377.
The number 7 becomes the next digit in our result. 
Result so far: 20.937
The remainder is 377 after subtracting 6153 from 6530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3770, and continue the process.

On to step 9:
The number 879 fits into 3770 4 times, leaving a remainder of 254.
Write down 4 as next digit of the result. 
Result so far: 20.9374
If we subtract 3516 from 3770, we get 254.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2540, and continue the process.

On to step 10:
The number 879 fits into 2540 2 times, leaving a remainder of 782.
The next digit of our result is 2. 
Result so far: 20.93742
If we subtract 1758 from 2540, we get 782.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7820, and continue the process.

Moving on to step 11:
The number 879 fits into 7820 8 times, leaving a remainder of 788.
The next digit of our result is 8. 
Result so far: 20.937428
Subtracting 7032 from 7820 leaves us with 788.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7880, and continue the process.

Advancing to step 12:
879 can be fit into 7880 8 times, resulting in a remainder of 848.
Use 8 as the next digit of our solution. 
Result so far: 20.9374288
Subtracting 7032 from 7880 leaves us with 848.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8480, and continue the process.

The final result is 20.9374288 with a remainder of 8.48e-06.