54195920 ÷ 561 
The aim is to understand the frequency of 561 in 54195920.

Step 1:
When dividing 5 by 561, we get 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Append the next digit (4) from the dividend to 5 and continue with: 54 / 561

On to step 2:
The number 561 fits into 54 0 times, leaving a remainder of 54.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 54, we get 54.
Append the next digit (1) from the dividend to 54 and continue with: 541 / 561

Moving on to step 3:
If we divide 541 by 561, we get 0 and a remainder of 541.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 541 to get 541.
Bring next digit (9) of the dividend behind the 541 and repeat the process: 5419 / 561

Let's proceed to step 4:
561 goes into 5419 9 times with a remainder of 370.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
Deduct 5049 from 5419 and we're left with 370.
Append the next digit (5) from the dividend to 370 and continue with: 3705 / 561

Going ahead to step 5:
561 can be fit into 3705 6 times, resulting in a remainder of 339.
Record the quotient 6 as the next digit in the result. 
Result so far: 96.0
If we take 3366 away from 3705, we end up with 339.
Take the next digit (9) from the dividend and append it to 339, then repeat: 3399 / 561

Step 6:
561 can be fit into 3399 6 times, resulting in a remainder of 33.
Use 6 as the next digit of our solution. 
Result so far: 966.0
Subtracting 3366 from 3399 leaves us with 33.
Bring next digit (2) of the dividend behind the 33 and repeat the process: 332 / 561

Moving on to step 7:
The number 561 fits into 332 0 times, leaving a remainder of 332.
Put 0 as the next digit of the answer. 
Result so far: 9660.0
The remainder is 332 after subtracting 0 from 332.
Grab the next digit (0) from the dividend, add it to 332, then carry on: 3320 / 561

Advancing to step 8:
When dividing 3320 by 561, we get 5 with a remainder of 515.
Use 5 as the next digit of our solution. 
Result so far: 96605.0
If we take 2805 away from 3320, we end up with 515.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5150, and continue the process.

Advancing to step 9:
If we divide 5150 by 561, we get 9 and a remainder of 101.
Use 9 as the next digit of our solution. 
Result so far: 96605.9
The remainder is 101 after subtracting 5049 from 5150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1010, and continue the process.

Let's proceed to step 10:
561 can be fit into 1010 1 times, resulting in a remainder of 449.
The number 1 becomes the next digit in our result. 
Result so far: 96605.91
Subtracting 561 from 1010 leaves us with 449.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4490, and continue the process.

Moving on to step 11:
561 can be fit into 4490 8 times, resulting in a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 96605.918
The remainder is 2 after subtracting 4488 from 4490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 12:
If we divide 20 by 561, we get 0 and a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 96605.918
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 13:
200 divided by 561 is 0 with a remainder of 200.
Write down 0 as next digit of the result. 
Result so far: 96605.918
If we subtract 0 from 200, we get 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Our division results in 96605.918 with a remaining 0.0002.