We look at the division of 63594 by 91 
The aim is to understand the frequency of 91 in 63594.

Advancing to step 1:
When dividing 6 by 91, we get 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Take the next digit (3) from the dividend and append it to 6, then repeat: 63 / 91

Step 2:
91 can be fit into 63 0 times, resulting in a remainder of 63.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 63 after subtracting 0 from 63.
Grab the next digit (5) from the dividend, add it to 63, then carry on: 635 / 91

Going ahead to step 3:
The number 91 fits into 635 6 times, leaving a remainder of 89.
Write down 6 as next digit of the result. 
Result so far: 6.0
If we take 546 away from 635, we end up with 89.
Take the next digit (9) from the dividend and append it to 89, then repeat: 899 / 91

Let's proceed to step 4:
If we divide 899 by 91, we get 9 and a remainder of 80.
The next digit of our result is 9. 
Result so far: 69.0
Subtracting 819 from 899 leaves us with 80.
Include the next digit (4) from the dividend after 80, then repeat: 804 / 91

Step 5:
91 goes into 804 8 times with a remainder of 76.
The number 8 becomes the next digit in our result. 
Result so far: 698.0
Deduct 728 from 804 and we're left with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Let's proceed to step 6:
If we divide 760 by 91, we get 8 and a remainder of 32.
The number 8 becomes the next digit in our result. 
Result so far: 698.8
Subtract 728 from 760 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.

Moving on to step 7:
If we divide 320 by 91, we get 3 and a remainder of 47.
Record the quotient 3 as the next digit in the result. 
Result so far: 698.83
The remainder is 47 after subtracting 273 from 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Advancing to step 8:
If we divide 470 by 91, we get 5 and a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 698.835
Deduct 455 from 470 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 9:
If we divide 150 by 91, we get 1 and a remainder of 59.
Write down 1 as next digit of the result. 
Result so far: 698.8351
If we take 91 away from 150, we end up 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.

On to step 10:
590 divided by 91 is 6 with a remainder of 44.
Write down 6 as next digit of the result. 
Result so far: 698.83516
The remainder is 44 after subtracting 546 from 590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Let's proceed to step 11:
If we divide 440 by 91, we get 4 and a remainder of 76.
Use 4 as the next digit of our solution. 
Result so far: 698.835164
If we take 364 away from 440, we end up with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Going ahead to step 12:
The number 91 fits into 760 8 times, leaving a remainder of 32.
The next digit of our result is 8. 
Result so far: 698.8351648
The remainder is 32 after subtracting 728 from 760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Moving on to step 13:
320 divided by 91 is 3 with a remainder of 47.
Write down 3 as next digit of the result. 
Result so far: 698.83516483
Deduct 273 from 320 and we're left with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

The final result is 698.83516483 with a remainder of 4.7e-08.