We look at the division of 21576743 by 531 
The aim is to understand the frequency of 531 in 21576743.

Let's proceed to step 1:
If we divide 2 by 531, we get 0 and a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 531

Going ahead to step 2:
531 goes into 21 0 times with a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Bring next digit (5) of the dividend behind the 21 and repeat the process: 215 / 531

Step 3:
The number 531 fits into 215 0 times, leaving a remainder of 215.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 215 after subtracting 0 from 215.
Grab the next digit (7) from the dividend, add it to 215, then carry on: 2157 / 531

Step 4:
If we divide 2157 by 531, we get 4 and a remainder of 33.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtract 2124 from 2157 to get 33.
Fetch the next digit (6) from the dividend, attach it to 33 and continue: 336 / 531

Let's proceed to step 5:
531 can be fit into 336 0 times, resulting in a remainder of 336.
Put 0 as the next digit of the answer. 
Result so far: 40.0
Subtract 0 from 336 to get 336.
Take the next digit (7) from the dividend and append it to 336, then repeat: 3367 / 531

On to step 6:
The number 531 fits into 3367 6 times, leaving a remainder of 181.
Write down 6 as next digit of the result. 
Result so far: 406.0
Subtracting 3186 from 3367 leaves us with 181.
Include the next digit (4) from the dividend after 181, then repeat: 1814 / 531

Advancing to step 7:
1814 divided by 531 is 3 with a remainder of 221.
Record the quotient 3 as the next digit in the result. 
Result so far: 4063.0
The remainder is 221 after subtracting 1593 from 1814.
Take the next digit (3) from the dividend and append it to 221, then repeat: 2213 / 531

Advancing to step 8:
531 goes into 2213 4 times with a remainder of 89.
Write down 4 as next digit of the result. 
Result so far: 40634.0
Subtract 2124 from 2213 to get 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

Let's proceed to step 9:
531 goes into 890 1 times with a remainder of 359.
Use 1 as the next digit of our solution. 
Result so far: 40634.1
Deduct 531 from 890 and we're left with 359.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3590, and continue the process.

Going ahead to step 10:
531 can be fit into 3590 6 times, resulting in a remainder of 404.
Put 6 as the next digit of the answer. 
Result so far: 40634.16
The remainder is 404 after subtracting 3186 from 3590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4040, and continue the process.

Step 11:
4040 divided by 531 is 7 with a remainder of 323.
The next digit of our result is 7. 
Result so far: 40634.167
Subtracting 3717 from 4040 leaves us with 323.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3230, and continue the process.

On to step 12:
531 goes into 3230 6 times with a remainder of 44.
Put 6 as the next digit of the answer. 
Result so far: 40634.1676
Deduct 3186 from 3230 and we're left with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Step 13:
If we divide 440 by 531, we get 0 and a remainder of 440.
Put 0 as the next digit of the answer. 
Result so far: 40634.1676
The remainder is 440 after subtracting 0 from 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

Moving on to step 14:
When dividing 4400 by 531, we get 8 with a remainder of 152.
Write down 8 as next digit of the result. 
Result so far: 40634.167608
Subtract 4248 from 4400 to get 152.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1520, and continue the process.

Going ahead to step 15:
531 can be fit into 1520 2 times, resulting in a remainder of 458.
Write down 2 as next digit of the result. 
Result so far: 40634.1676082
Deduct 1062 from 1520 and we're left with 458.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4580, and continue the process.

On to step 16:
When dividing 4580 by 531, we get 8 with a remainder of 332.
Write down 8 as next digit of the result. 
Result so far: 40634.16760828
If we take 4248 away from 4580, we end up with 332.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3320, and continue the process.

After the division, we end up with 40634.16760828 and a remainder of 3.32e-07.