We're dividing 81808392 by 936 
The aim is to understand the frequency of 936 in 81808392.

On to step 1:
If we divide 8 by 936, we get 0 and a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 936

Advancing to step 2:
81 divided by 936 is 0 with a remainder of 81.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 81 to get 81.
Take the next digit (8) from the dividend and append it to 81, then repeat: 818 / 936

Going ahead to step 3:
When dividing 818 by 936, we get 0 with a remainder of 818.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 818 leaves us with 818.
Bring next digit (0) of the dividend behind the 818 and repeat the process: 8180 / 936

Moving on to step 4:
If we divide 8180 by 936, we get 8 and a remainder of 692.
The next digit of our result is 8. 
Result so far: 8.0
Subtract 7488 from 8180 to get 692.
Include the next digit (8) from the dividend after 692, then repeat: 6928 / 936

On to step 5:
936 can be fit into 6928 7 times, resulting in a remainder of 376.
Use 7 as the next digit of our solution. 
Result so far: 87.0
If we take 6552 away from 6928, we end up with 376.
Append the next digit (3) from the dividend to 376 and continue with: 3763 / 936

Going ahead to step 6:
936 goes into 3763 4 times with a remainder of 19.
Record the quotient 4 as the next digit in the result. 
Result so far: 874.0
Subtracting 3744 from 3763 leaves us with 19.
Include the next digit (9) from the dividend after 19, then repeat: 199 / 936

Moving on to step 7:
If we divide 199 by 936, we get 0 and a remainder of 199.
Record the quotient 0 as the next digit in the result. 
Result so far: 8740.0
If we take 0 away from 199, we end up with 199.
Bring next digit (2) of the dividend behind the 199 and repeat the process: 1992 / 936

Going ahead to step 8:
936 goes into 1992 2 times with a remainder of 120.
Record the quotient 2 as the next digit in the result. 
Result so far: 87402.0
Deduct 1872 from 1992 and we're left with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Moving on to step 9:
1200 divided by 936 is 1 with a remainder of 264.
Put 1 as the next digit of the answer. 
Result so far: 87402.1
If we take 936 away from 1200, we end up with 264.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2640, and continue the process.

Advancing to step 10:
936 can be fit into 2640 2 times, resulting in a remainder of 768.
Write down 2 as next digit of the result. 
Result so far: 87402.12
If we take 1872 away from 2640, we end up with 768.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7680, and continue the process.

Advancing to step 11:
When dividing 7680 by 936, we get 8 with a remainder of 192.
The number 8 becomes the next digit in our result. 
Result so far: 87402.128
The remainder is 192 after subtracting 7488 from 7680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

On to step 12:
1920 divided by 936 is 2 with a remainder of 48.
Put 2 as the next digit of the answer. 
Result so far: 87402.1282
If we subtract 1872 from 1920, we get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Moving on to step 13:
480 divided by 936 is 0 with a remainder of 480.
Use 0 as the next digit of our solution. 
Result so far: 87402.1282
If we subtract 0 from 480, we get 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

On to step 14:
The number 936 fits into 4800 5 times, leaving a remainder of 120.
Put 5 as the next digit of the answer. 
Result so far: 87402.128205
Subtracting 4680 from 4800 leaves us with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Advancing to step 15:
936 goes into 1200 1 times with a remainder of 264.
Record the quotient 1 as the next digit in the result. 
Result so far: 87402.1282051
Deduct 936 from 1200 and we're left with 264.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2640, and continue the process.

Going ahead to step 16:
936 can be fit into 2640 2 times, resulting in a remainder of 768.
The next digit of our result is 2. 
Result so far: 87402.12820512
If we subtract 1872 from 2640, we get 768.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7680, and continue the process.

The final result is 87402.12820512 with a remainder of 7.68e-07.