9215343 divided by 561 
The aim is to understand the frequency of 561 in 9215343.

Moving on to step 1:
When dividing 9 by 561, we get 0 with a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Fetch the next digit (2) from the dividend, attach it to 9 and continue: 92 / 561

On to step 2:
The number 561 fits into 92 0 times, leaving a remainder of 92.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 92 and we're left with 92.
Grab the next digit (1) from the dividend, add it to 92, then carry on: 921 / 561

Step 3:
The number 561 fits into 921 1 times, leaving a remainder of 360.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 561 away from 921, we end up with 360.
Bring next digit (5) of the dividend behind the 360 and repeat the process: 3605 / 561

Moving on to step 4:
561 can be fit into 3605 6 times, resulting in a remainder of 239.
The next digit of our result is 6. 
Result so far: 16.0
Subtracting 3366 from 3605 leaves us with 239.
Take the next digit (3) from the dividend and append it to 239, then repeat: 2393 / 561

Going ahead to step 5:
When dividing 2393 by 561, we get 4 with a remainder of 149.
Write down 4 as next digit of the result. 
Result so far: 164.0
The remainder is 149 after subtracting 2244 from 2393.
Bring next digit (4) of the dividend behind the 149 and repeat the process: 1494 / 561

Step 6:
561 goes into 1494 2 times with a remainder of 372.
The next digit of our result is 2. 
Result so far: 1642.0
Subtracting 1122 from 1494 leaves us with 372.
Grab the next digit (3) from the dividend, add it to 372, then carry on: 3723 / 561

Let's proceed to step 7:
3723 divided by 561 is 6 with a remainder of 357.
The number 6 becomes the next digit in our result. 
Result so far: 16426.0
Subtract 3366 from 3723 to get 357.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3570, and continue the process.

Going ahead to step 8:
561 goes into 3570 6 times with a remainder of 204.
Use 6 as the next digit of our solution. 
Result so far: 16426.6
Subtracting 3366 from 3570 leaves us with 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

Moving on to step 9:
561 goes into 2040 3 times with a remainder of 357.
The number 3 becomes the next digit in our result. 
Result so far: 16426.63
If we subtract 1683 from 2040, we get 357.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3570, and continue the process.

Going ahead to step 10:
The number 561 fits into 3570 6 times, leaving a remainder of 204.
Put 6 as the next digit of the answer. 
Result so far: 16426.636
If we subtract 3366 from 3570, we get 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

Moving on to step 11:
If we divide 2040 by 561, we get 3 and a remainder of 357.
Write down 3 as next digit of the result. 
Result so far: 16426.6363
If we subtract 1683 from 2040, we get 357.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3570, and continue the process.

On to step 12:
3570 divided by 561 is 6 with a remainder of 204.
Use 6 as the next digit of our solution. 
Result so far: 16426.63636
The remainder is 204 after subtracting 3366 from 3570.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

Advancing to step 13:
561 goes into 2040 3 times with a remainder of 357.
Use 3 as the next digit of our solution. 
Result so far: 16426.636363
If we take 1683 away from 2040, we end up with 357.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3570, and continue the process.

Advancing to step 14:
The number 561 fits into 3570 6 times, leaving a remainder of 204.
Use 6 as the next digit of our solution. 
Result so far: 16426.6363636
Deduct 3366 from 3570 and we're left with 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

Step 15:
The number 561 fits into 2040 3 times, leaving a remainder of 357.
The next digit of our result is 3. 
Result so far: 16426.63636363
Subtract 1683 from 2040 to get 357.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3570, and continue the process.

After the division, we end up with 16426.63636363 and a remainder of 3.57e-07.