We look at the division of 81135080 by 608 
The aim is to understand the frequency of 608 in 81135080.

Advancing to step 1:
8 divided by 608 is 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Take the next digit (1) from the dividend and append it to 8, then repeat: 81 / 608

Advancing to step 2:
81 divided by 608 is 0 with a remainder of 81.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 81 to get 81.
Take the next digit (1) from the dividend and append it to 81, then repeat: 811 / 608

Step 3:
608 can be fit into 811 1 times, resulting in a remainder of 203.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 608 from 811 and we're left with 203.
Include the next digit (3) from the dividend after 203, then repeat: 2033 / 608

On to step 4:
608 can be fit into 2033 3 times, resulting in a remainder of 209.
Write down 3 as next digit of the result. 
Result so far: 13.0
The remainder is 209 after subtracting 1824 from 2033.
Append the next digit (5) from the dividend to 209 and continue with: 2095 / 608

On to step 5:
608 goes into 2095 3 times with a remainder of 271.
Record the quotient 3 as the next digit in the result. 
Result so far: 133.0
Deduct 1824 from 2095 and we're left with 271.
Grab the next digit (0) from the dividend, add it to 271, then carry on: 2710 / 608

Going ahead to step 6:
2710 divided by 608 is 4 with a remainder of 278.
Use 4 as the next digit of our solution. 
Result so far: 1334.0
Subtract 2432 from 2710 to get 278.
Include the next digit (8) from the dividend after 278, then repeat: 2788 / 608

Let's proceed to step 7:
608 goes into 2788 4 times with a remainder of 356.
Use 4 as the next digit of our solution. 
Result so far: 13344.0
If we subtract 2432 from 2788, we get 356.
Bring next digit (0) of the dividend behind the 356 and repeat the process: 3560 / 608

Moving on to step 8:
608 goes into 3560 5 times with a remainder of 520.
Use 5 as the next digit of our solution. 
Result so far: 133445.0
The remainder is 520 after subtracting 3040 from 3560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5200, and continue the process.

Moving on to step 9:
When dividing 5200 by 608, we get 8 with a remainder of 336.
Put 8 as the next digit of the answer. 
Result so far: 133445.8
If we subtract 4864 from 5200, we get 336.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3360, and continue the process.

Advancing to step 10:
If we divide 3360 by 608, we get 5 and a remainder of 320.
Use 5 as the next digit of our solution. 
Result so far: 133445.85
If we subtract 3040 from 3360, we get 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Let's proceed to step 11:
3200 divided by 608 is 5 with a remainder of 160.
The number 5 becomes the next digit in our result. 
Result so far: 133445.855
The remainder is 160 after subtracting 3040 from 3200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

The quotient of the division is 133445.855, and the remainder is 0.016.