We're dividing 81756225 by 531 
The aim is to understand the frequency of 531 in 81756225.

Let's proceed to step 1:
8 divided by 531 is 0 with 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 (1) of the dividend behind the 8 and repeat the process: 81 / 531

Advancing to step 2:
81 divided by 531 is 0 with a remainder of 81.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 81, we get 81.
Fetch the next digit (7) from the dividend, attach it to 81 and continue: 817 / 531

Going ahead to step 3:
When dividing 817 by 531, we get 1 with a remainder of 286.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 286 after subtracting 531 from 817.
Include the next digit (5) from the dividend after 286, then repeat: 2865 / 531

Advancing to step 4:
531 goes into 2865 5 times with a remainder of 210.
Write down 5 as next digit of the result. 
Result so far: 15.0
Subtracting 2655 from 2865 leaves us with 210.
Grab the next digit (6) from the dividend, add it to 210, then carry on: 2106 / 531

On to step 5:
The number 531 fits into 2106 3 times, leaving a remainder of 513.
Write down 3 as next digit of the result. 
Result so far: 153.0
Subtract 1593 from 2106 to get 513.
Bring next digit (2) of the dividend behind the 513 and repeat the process: 5132 / 531

On to step 6:
531 goes into 5132 9 times with a remainder of 353.
Write down 9 as next digit of the result. 
Result so far: 1539.0
Subtract 4779 from 5132 to get 353.
Take the next digit (2) from the dividend and append it to 353, then repeat: 3532 / 531

Advancing to step 7:
531 goes into 3532 6 times with a remainder of 346.
Write down 6 as next digit of the result. 
Result so far: 15396.0
Deduct 3186 from 3532 and we're left with 346.
Bring next digit (5) of the dividend behind the 346 and repeat the process: 3465 / 531

Advancing to step 8:
531 goes into 3465 6 times with a remainder of 279.
Put 6 as the next digit of the answer. 
Result so far: 153966.0
If we subtract 3186 from 3465, we get 279.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2790, and continue the process.

On to step 9:
When dividing 2790 by 531, we get 5 with a remainder of 135.
Use 5 as the next digit of our solution. 
Result so far: 153966.5
If we subtract 2655 from 2790, we get 135.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1350, and continue the process.

Advancing to step 10:
When dividing 1350 by 531, we get 2 with a remainder of 288.
Write down 2 as next digit of the result. 
Result so far: 153966.52
Subtract 1062 from 1350 to get 288.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2880, and continue the process.

Let's proceed to step 11:
When dividing 2880 by 531, we get 5 with a remainder of 225.
The number 5 becomes the next digit in our result. 
Result so far: 153966.525
Subtract 2655 from 2880 to get 225.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2250, and continue the process.

Going ahead to step 12:
When dividing 2250 by 531, we get 4 with a remainder of 126.
The next digit of our result is 4. 
Result so far: 153966.5254
The remainder is 126 after subtracting 2124 from 2250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1260, and continue the process.

Advancing to step 13:
1260 divided by 531 is 2 with a remainder of 198.
Use 2 as the next digit of our solution. 
Result so far: 153966.52542
If we subtract 1062 from 1260, we get 198.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1980, and continue the process.

On to step 14:
531 can be fit into 1980 3 times, resulting in a remainder of 387.
The number 3 becomes the next digit in our result. 
Result so far: 153966.525423
Subtract 1593 from 1980 to get 387.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3870, and continue the process.

Step 15:
When dividing 3870 by 531, we get 7 with a remainder of 153.
The number 7 becomes the next digit in our result. 
Result so far: 153966.5254237
If we subtract 3717 from 3870, we get 153.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1530, and continue the process.

Let's proceed to step 16:
If we divide 1530 by 531, we get 2 and a remainder of 468.
Record the quotient 2 as the next digit in the result. 
Result so far: 153966.52542372
Subtract 1062 from 1530 to get 468.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4680, and continue the process.

In conclusion, the division gives 153966.52542372 with a balance of 4.68e-07.