We look at the division of 82104543 by 561 
The aim is to understand the frequency of 561 in 82104543.

On to step 1:
561 goes into 8 0 times with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Append the next digit (2) from the dividend to 8 and continue with: 82 / 561

Let's proceed to step 2:
If we divide 82 by 561, we get 0 and a remainder of 82.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 82, we end up with 82.
Grab the next digit (1) from the dividend, add it to 82, then carry on: 821 / 561

Step 3:
If we divide 821 by 561, we get 1 and a remainder of 260.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 561 from 821, we get 260.
Fetch the next digit (0) from the dividend, attach it to 260 and continue: 2600 / 561

Moving on to step 4:
2600 divided by 561 is 4 with a remainder of 356.
Record the quotient 4 as the next digit in the result. 
Result so far: 14.0
The remainder is 356 after subtracting 2244 from 2600.
Fetch the next digit (4) from the dividend, attach it to 356 and continue: 3564 / 561

Advancing to step 5:
If we divide 3564 by 561, we get 6 and a remainder of 198.
The next digit of our result is 6. 
Result so far: 146.0
The remainder is 198 after subtracting 3366 from 3564.
Grab the next digit (5) from the dividend, add it to 198, then carry on: 1985 / 561

On to step 6:
The number 561 fits into 1985 3 times, leaving a remainder of 302.
The next digit of our result is 3. 
Result so far: 1463.0
Subtracting 1683 from 1985 leaves us with 302.
Grab the next digit (4) from the dividend, add it to 302, then carry on: 3024 / 561

Going ahead to step 7:
The number 561 fits into 3024 5 times, leaving a remainder of 219.
Write down 5 as next digit of the result. 
Result so far: 14635.0
Subtracting 2805 from 3024 leaves us with 219.
Fetch the next digit (3) from the dividend, attach it to 219 and continue: 2193 / 561

Step 8:
561 can be fit into 2193 3 times, resulting in a remainder of 510.
The number 3 becomes the next digit in our result. 
Result so far: 146353.0
Subtract 1683 from 2193 to get 510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5100, and continue the process.

Step 9:
561 can be fit into 5100 9 times, resulting in a remainder of 51.
Record the quotient 9 as the next digit in the result. 
Result so far: 146353.9
Subtract 5049 from 5100 to get 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Advancing to step 10:
If we divide 510 by 561, we get 0 and a remainder of 510.
Put 0 as the next digit of the answer. 
Result so far: 146353.9
The remainder is 510 after subtracting 0 from 510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5100, and continue the process.

Let's proceed to step 11:
The number 561 fits into 5100 9 times, leaving a remainder of 51.
Record the quotient 9 as the next digit in the result. 
Result so far: 146353.909
If we take 5049 away from 5100, we end up with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Moving on to step 12:
561 can be fit into 510 0 times, resulting in a remainder of 510.
Use 0 as the next digit of our solution. 
Result so far: 146353.909
If we take 0 away from 510, we end up with 510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5100, and continue the process.

Step 13:
561 goes into 5100 9 times with a remainder of 51.
The number 9 becomes the next digit in our result. 
Result so far: 146353.90909
Subtracting 5049 from 5100 leaves us with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Going ahead to step 14:
561 goes into 510 0 times with a remainder of 510.
Use 0 as the next digit of our solution. 
Result so far: 146353.90909
If we take 0 away from 510, we end up with 510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5100, and continue the process.

On to step 15:
If we divide 5100 by 561, we get 9 and a remainder of 51.
Record the quotient 9 as the next digit in the result. 
Result so far: 146353.9090909
The remainder is 51 after subtracting 5049 from 5100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Going ahead to step 16:
561 goes into 510 0 times with a remainder of 510.
The next digit of our result is 0. 
Result so far: 146353.9090909
Subtract 0 from 510 to get 510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5100, and continue the process.

The final outcome is 146353.9090909, with a leftover of 5.1e-07.