We look at the division of 81550612 by 538 
The aim is to understand the frequency of 538 in 81550612.

Step 1:
If we divide 8 by 538, we get 0 and a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 538

Moving on to step 2:
81 divided by 538 is 0 with a remainder of 81.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 81 leaves us with 81.
Bring next digit (5) of the dividend behind the 81 and repeat the process: 815 / 538

On to step 3:
538 goes into 815 1 times with a remainder of 277.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 538 from 815 to get 277.
Append the next digit (5) from the dividend to 277 and continue with: 2775 / 538

Moving on to step 4:
The number 538 fits into 2775 5 times, leaving a remainder of 85.
Put 5 as the next digit of the answer. 
Result so far: 15.0
The remainder is 85 after subtracting 2690 from 2775.
Append the next digit (0) from the dividend to 85 and continue with: 850 / 538

Advancing to step 5:
850 divided by 538 is 1 with a remainder of 312.
The next digit of our result is 1. 
Result so far: 151.0
The remainder is 312 after subtracting 538 from 850.
Grab the next digit (6) from the dividend, add it to 312, then carry on: 3126 / 538

Let's proceed to step 6:
The number 538 fits into 3126 5 times, leaving a remainder of 436.
Write down 5 as next digit of the result. 
Result so far: 1515.0
Subtract 2690 from 3126 to get 436.
Grab the next digit (1) from the dividend, add it to 436, then carry on: 4361 / 538

Advancing to step 7:
If we divide 4361 by 538, we get 8 and a remainder of 57.
Record the quotient 8 as the next digit in the result. 
Result so far: 15158.0
If we subtract 4304 from 4361, we get 57.
Take the next digit (2) from the dividend and append it to 57, then repeat: 572 / 538

Advancing to step 8:
538 goes into 572 1 times with a remainder of 34.
Record the quotient 1 as the next digit in the result. 
Result so far: 151581.0
If we take 538 away from 572, we end up with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Let's proceed to step 9:
538 can be fit into 340 0 times, resulting in a remainder of 340.
The next digit of our result is 0. 
Result so far: 151581.0
The remainder is 340 after subtracting 0 from 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

On to step 10:
538 can be fit into 3400 6 times, resulting in a remainder of 172.
Put 6 as the next digit of the answer. 
Result so far: 151581.06
The remainder is 172 after subtracting 3228 from 3400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1720, and continue the process.

Let's proceed to step 11:
538 goes into 1720 3 times with a remainder of 106.
Record the quotient 3 as the next digit in the result. 
Result so far: 151581.063
Subtract 1614 from 1720 to get 106.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1060, and continue the process.

On to step 12:
When dividing 1060 by 538, we get 1 with a remainder of 522.
Record the quotient 1 as the next digit in the result. 
Result so far: 151581.0631
Deduct 538 from 1060 and we're left with 522.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5220, and continue the process.

Let's proceed to step 13:
If we divide 5220 by 538, we get 9 and a remainder of 378.
Record the quotient 9 as the next digit in the result. 
Result so far: 151581.06319
If we take 4842 away from 5220, we end up with 378.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3780, and continue the process.

Moving on to step 14:
When dividing 3780 by 538, we get 7 with a remainder of 14.
The number 7 becomes the next digit in our result. 
Result so far: 151581.063197
Subtracting 3766 from 3780 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 15:
538 goes into 140 0 times with a remainder of 140.
Put 0 as the next digit of the answer. 
Result so far: 151581.063197
Subtract 0 from 140 to get 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Advancing to step 16:
The number 538 fits into 1400 2 times, leaving a remainder of 324.
Use 2 as the next digit of our solution. 
Result so far: 151581.06319702
Subtracting 1076 from 1400 leaves us with 324.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3240, and continue the process.

The quotient of the division is 151581.06319702, and the remainder is 3.24e-07.