We're dividing 85641888 by 538 
The aim is to understand the frequency of 538 in 85641888.

Advancing to step 1:
The number 538 fits into 8 0 times, leaving a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Bring next digit (5) of the dividend behind the 8 and repeat the process: 85 / 538

Going ahead to step 2:
85 divided by 538 is 0 with a remainder of 85.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 85 to get 85.
Take the next digit (6) from the dividend and append it to 85, then repeat: 856 / 538

Going ahead to step 3:
538 goes into 856 1 times with a remainder of 318.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 538 from 856 leaves us with 318.
Append the next digit (4) from the dividend to 318 and continue with: 3184 / 538

On to step 4:
When dividing 3184 by 538, we get 5 with a remainder of 494.
Use 5 as the next digit of our solution. 
Result so far: 15.0
If we subtract 2690 from 3184, we get 494.
Take the next digit (1) from the dividend and append it to 494, then repeat: 4941 / 538

Moving on to step 5:
If we divide 4941 by 538, we get 9 and a remainder of 99.
The number 9 becomes the next digit in our result. 
Result so far: 159.0
Subtracting 4842 from 4941 leaves us with 99.
Bring next digit (8) of the dividend behind the 99 and repeat the process: 998 / 538

Moving on to step 6:
The number 538 fits into 998 1 times, leaving a remainder of 460.
Write down 1 as next digit of the result. 
Result so far: 1591.0
Deduct 538 from 998 and we're left with 460.
Take the next digit (8) from the dividend and append it to 460, then repeat: 4608 / 538

Let's proceed to step 7:
538 goes into 4608 8 times with a remainder of 304.
Use 8 as the next digit of our solution. 
Result so far: 15918.0
If we take 4304 away from 4608, we end up with 304.
Take the next digit (8) from the dividend and append it to 304, then repeat: 3048 / 538

On to step 8:
The number 538 fits into 3048 5 times, leaving a remainder of 358.
Write down 5 as next digit of the result. 
Result so far: 159185.0
Deduct 2690 from 3048 and we're left with 358.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3580, and continue the process.

Going ahead to step 9:
When dividing 3580 by 538, we get 6 with a remainder of 352.
The number 6 becomes the next digit in our result. 
Result so far: 159185.6
Subtract 3228 from 3580 to get 352.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

Advancing to step 10:
538 can be fit into 3520 6 times, resulting in a remainder of 292.
Put 6 as the next digit of the answer. 
Result so far: 159185.66
Subtracting 3228 from 3520 leaves us with 292.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2920, and continue the process.

After the division, we end up with 159185.66 and a remainder of 0.292.