We look at the division of 87129847 by 808 
The aim is to understand the frequency of 808 in 87129847.

Let's proceed to step 1:
When dividing 8 by 808, we get 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Append the next digit (7) from the dividend to 8 and continue with: 87 / 808

On to step 2:
The number 808 fits into 87 0 times, leaving a remainder of 87.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 87 and we're left with 87.
Append the next digit (1) from the dividend to 87 and continue with: 871 / 808

Step 3:
808 can be fit into 871 1 times, resulting in a remainder of 63.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 808 from 871 leaves us with 63.
Take the next digit (2) from the dividend and append it to 63, then repeat: 632 / 808

Let's proceed to step 4:
808 goes into 632 0 times with a remainder of 632.
The next digit of our result is 0. 
Result so far: 10.0
The remainder is 632 after subtracting 0 from 632.
Include the next digit (9) from the dividend after 632, then repeat: 6329 / 808

Advancing to step 5:
808 goes into 6329 7 times with a remainder of 673.
Write down 7 as next digit of the result. 
Result so far: 107.0
If we subtract 5656 from 6329, we get 673.
Fetch the next digit (8) from the dividend, attach it to 673 and continue: 6738 / 808

Advancing to step 6:
When dividing 6738 by 808, we get 8 with a remainder of 274.
Use 8 as the next digit of our solution. 
Result so far: 1078.0
If we subtract 6464 from 6738, we get 274.
Include the next digit (4) from the dividend after 274, then repeat: 2744 / 808

Let's proceed to step 7:
The number 808 fits into 2744 3 times, leaving a remainder of 320.
Record the quotient 3 as the next digit in the result. 
Result so far: 10783.0
The remainder is 320 after subtracting 2424 from 2744.
Grab the next digit (7) from the dividend, add it to 320, then carry on: 3207 / 808

Advancing to step 8:
808 goes into 3207 3 times with a remainder of 783.
Use 3 as the next digit of our solution. 
Result so far: 107833.0
If we subtract 2424 from 3207, we get 783.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7830, and continue the process.

Step 9:
The number 808 fits into 7830 9 times, leaving a remainder of 558.
Write down 9 as next digit of the result. 
Result so far: 107833.9
If we take 7272 away from 7830, we end up with 558.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5580, and continue the process.

Let's proceed to step 10:
808 can be fit into 5580 6 times, resulting in a remainder of 732.
The number 6 becomes the next digit in our result. 
Result so far: 107833.96
Subtracting 4848 from 5580 leaves us with 732.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7320, and continue the process.

Step 11:
808 goes into 7320 9 times with a remainder of 48.
Write down 9 as next digit of the result. 
Result so far: 107833.969
Subtract 7272 from 7320 to 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.

Advancing to step 12:
480 divided by 808 is 0 with a remainder of 480.
The number 0 becomes the next digit in our result. 
Result so far: 107833.969
The remainder is 480 after subtracting 0 from 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Let's proceed to step 13:
808 goes into 4800 5 times with a remainder of 760.
The number 5 becomes the next digit in our result. 
Result so far: 107833.96905
If we subtract 4040 from 4800, we get 760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7600, and continue the process.

On to step 14:
If we divide 7600 by 808, we get 9 and a remainder of 328.
Put 9 as the next digit of the answer. 
Result so far: 107833.969059
The remainder is 328 after subtracting 7272 from 7600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3280, and continue the process.

Moving on to step 15:
808 can be fit into 3280 4 times, resulting in a remainder of 48.
Record the quotient 4 as the next digit in the result. 
Result so far: 107833.9690594
Deduct 3232 from 3280 and we're left with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

On to step 16:
808 can be fit into 480 0 times, resulting in a remainder of 480.
The number 0 becomes the next digit in our result. 
Result so far: 107833.9690594
Subtracting 0 from 480 leaves us with 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Our division results in 107833.9690594 with a remaining 4.8e-07.