We look at the division of 561531 by 64 
The aim is to understand the frequency of 64 in 561531.

Advancing to step 1:
5 divided by 64 is 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Fetch the next digit (6) from the dividend, attach it to 5 and continue: 56 / 64

On to step 2:
When dividing 56 by 64, we get 0 with a remainder of 56.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 56, we get 56.
Append the next digit (1) from the dividend to 56 and continue with: 561 / 64

Let's proceed to step 3:
64 can be fit into 561 8 times, resulting in a remainder of 49.
Use 8 as the next digit of our solution. 
Result so far: 8.0
Deduct 512 from 561 and we're left with 49.
Grab the next digit (5) from the dividend, add it to 49, then carry on: 495 / 64

Advancing to step 4:
The number 64 fits into 495 7 times, leaving a remainder of 47.
Put 7 as the next digit of the answer. 
Result so far: 87.0
Subtract 448 from 495 to get 47.
Bring next digit (3) of the dividend behind the 47 and repeat the process: 473 / 64

Step 5:
473 divided by 64 is 7 with a remainder of 25.
The number 7 becomes the next digit in our result. 
Result so far: 877.0
The remainder is 25 after subtracting 448 from 473.
Append the next digit (1) from the dividend to 25 and continue with: 251 / 64

Let's proceed to step 6:
64 goes into 251 3 times with a remainder of 59.
Write down 3 as next digit of the result. 
Result so far: 8773.0
Deduct 192 from 251 and we're left with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Going ahead to step 7:
The number 64 fits into 590 9 times, leaving a remainder of 14.
The number 9 becomes the next digit in our result. 
Result so far: 8773.9
The remainder is 14 after subtracting 576 from 590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 8:
The number 64 fits into 140 2 times, leaving a remainder of 12.
The next digit of our result is 2. 
Result so far: 8773.92
The remainder is 12 after subtracting 128 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 9:
64 can be fit into 120 1 times, resulting in a remainder of 56.
Write down 1 as next digit of the result. 
Result so far: 8773.921
The remainder is 56 after subtracting 64 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Let's proceed to step 10:
The number 64 fits into 560 8 times, leaving a remainder of 48.
The number 8 becomes the next digit in our result. 
Result so far: 8773.9218
Subtract 512 from 560 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Going ahead to step 11:
64 goes into 480 7 times with a remainder of 32.
Record the quotient 7 as the next digit in the result. 
Result so far: 8773.92187
Subtract 448 from 480 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Going ahead to step 12:
320 divided by 64 is 5 with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 8773.921875
Deduct 320 from 320 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 13:
The number 64 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 8773.921875
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 14:
64 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 8773.921875
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 8773.921875 and a remainder of 0.0.