We look at the division of 90696493 by 561 
The aim is to understand the frequency of 561 in 90696493.

Advancing to step 1:
561 can be fit into 9 0 times, resulting in a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Include the next digit (0) from the dividend after 9, then repeat: 90 / 561

Step 2:
The number 561 fits into 90 0 times, leaving a remainder of 90.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 90, we end up with 90.
Include the next digit (6) from the dividend after 90, then repeat: 906 / 561

Going ahead to step 3:
561 goes into 906 1 times with a remainder of 345.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 561 from 906 leaves us with 345.
Bring next digit (9) of the dividend behind the 345 and repeat the process: 3459 / 561

Step 4:
561 goes into 3459 6 times with a remainder of 93.
Put 6 as the next digit of the answer. 
Result so far: 16.0
If we subtract 3366 from 3459, we get 93.
Fetch the next digit (6) from the dividend, attach it to 93 and continue: 936 / 561

On to step 5:
936 divided by 561 is 1 with a remainder of 375.
Put 1 as the next digit of the answer. 
Result so far: 161.0
If we subtract 561 from 936, we get 375.
Bring next digit (4) of the dividend behind the 375 and repeat the process: 3754 / 561

Advancing to step 6:
The number 561 fits into 3754 6 times, leaving a remainder of 388.
The number 6 becomes the next digit in our result. 
Result so far: 1616.0
Deduct 3366 from 3754 and we're left with 388.
Take the next digit (9) from the dividend and append it to 388, then repeat: 3889 / 561

Advancing to step 7:
The number 561 fits into 3889 6 times, leaving a remainder of 523.
Use 6 as the next digit of our solution. 
Result so far: 16166.0
Deduct 3366 from 3889 and we're left with 523.
Append the next digit (3) from the dividend to 523 and continue with: 5233 / 561

Advancing to step 8:
5233 divided by 561 is 9 with a remainder of 184.
The number 9 becomes the next digit in our result. 
Result so far: 161669.0
Subtracting 5049 from 5233 leaves us with 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

On to step 9:
When dividing 1840 by 561, we get 3 with a remainder of 157.
The next digit of our result is 3. 
Result so far: 161669.3
If we take 1683 away from 1840, we end up with 157.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1570, and continue the process.

On to step 10:
If we divide 1570 by 561, we get 2 and a remainder of 448.
Use 2 as the next digit of our solution. 
Result so far: 161669.32
The remainder is 448 after subtracting 1122 from 1570.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4480, and continue the process.

Moving on to step 11:
When dividing 4480 by 561, we get 7 with a remainder of 553.
The next digit of our result is 7. 
Result so far: 161669.327
If we subtract 3927 from 4480, we get 553.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5530, and continue the process.

Step 12:
561 can be fit into 5530 9 times, resulting in a remainder of 481.
Write down 9 as next digit of the result. 
Result so far: 161669.3279
If we subtract 5049 from 5530, we get 481.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4810, and continue the process.

Advancing to step 13:
When dividing 4810 by 561, we get 8 with a remainder of 322.
The next digit of our result is 8. 
Result so far: 161669.32798
Subtract 4488 from 4810 to get 322.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3220, and continue the process.

Moving on to step 14:
The number 561 fits into 3220 5 times, leaving a remainder of 415.
Record the quotient 5 as the next digit in the result. 
Result so far: 161669.327985
Subtract 2805 from 3220 to get 415.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4150, and continue the process.

Moving on to step 15:
561 can be fit into 4150 7 times, resulting in a remainder of 223.
The number 7 becomes the next digit in our result. 
Result so far: 161669.3279857
Subtracting 3927 from 4150 leaves us with 223.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2230, and continue the process.

Advancing to step 16:
2230 divided by 561 is 3 with a remainder of 547.
Record the quotient 3 as the next digit in the result. 
Result so far: 161669.32798573
If we subtract 1683 from 2230, we get 547.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5470, and continue the process.

The final result is 161669.32798573 with a remainder of 5.47e-07.