59971399 ÷ 91 
The aim is to understand the frequency of 91 in 59971399.

On to step 1:
91 can be fit into 5 0 times, resulting in a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Take the next digit (9) from the dividend and append it to 5, then repeat: 59 / 91

Going ahead to step 2:
59 divided by 91 is 0 with a remainder of 59.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 59, we end up with 59.
Include the next digit (9) from the dividend after 59, then repeat: 599 / 91

On to step 3:
91 can be fit into 599 6 times, resulting in a remainder of 53.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
If we take 546 away from 599, we end up with 53.
Bring next digit (7) of the dividend behind the 53 and repeat the process: 537 / 91

Let's proceed to step 4:
537 divided by 91 is 5 with a remainder of 82.
The next digit of our result is 5. 
Result so far: 65.0
If we take 455 away from 537, we end up with 82.
Take the next digit (1) from the dividend and append it to 82, then repeat: 821 / 91

Advancing to step 5:
821 divided by 91 is 9 with a remainder of 2.
Record the quotient 9 as the next digit in the result. 
Result so far: 659.0
If we subtract 819 from 821, we get 2.
Fetch the next digit (3) from the dividend, attach it to 2 and continue: 23 / 91

Going ahead to step 6:
91 goes into 23 0 times with a remainder of 23.
Use 0 as the next digit of our solution. 
Result so far: 6590.0
Subtract 0 from 23 to get 23.
Take the next digit (9) from the dividend and append it to 23, then repeat: 239 / 91

Step 7:
239 divided by 91 is 2 with a remainder of 57.
Put 2 as the next digit of the answer. 
Result so far: 65902.0
Subtracting 182 from 239 leaves us with 57.
Bring next digit (9) of the dividend behind the 57 and repeat the process: 579 / 91

Moving on to step 8:
The number 91 fits into 579 6 times, leaving a remainder of 33.
Write down 6 as next digit of the result. 
Result so far: 659026.0
Subtracting 546 from 579 leaves us with 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

On to step 9:
91 can be fit into 330 3 times, resulting in a remainder of 57.
Use 3 as the next digit of our solution. 
Result so far: 659026.3
If we take 273 away from 330, we end up with 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Advancing to step 10:
When dividing 570 by 91, we get 6 with a remainder of 24.
The number 6 becomes the next digit in our result. 
Result so far: 659026.36
Deduct 546 from 570 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 11:
When dividing 240 by 91, we get 2 with a remainder of 58.
The next digit of our result is 2. 
Result so far: 659026.362
The remainder is 58 after subtracting 182 from 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Let's proceed to step 12:
580 divided by 91 is 6 with a remainder of 34.
Put 6 as the next digit of the answer. 
Result so far: 659026.3626
If we subtract 546 from 580, we get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Let's proceed to step 13:
If we divide 340 by 91, we get 3 and a remainder of 67.
Write down 3 as next digit of the result. 
Result so far: 659026.36263
If we take 273 away from 340, we end up with 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Step 14:
The number 91 fits into 670 7 times, leaving a remainder of 33.
Write down 7 as next digit of the result. 
Result so far: 659026.362637
If we take 637 away from 670, we end up with 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Let's proceed to step 15:
91 can be fit into 330 3 times, resulting in a remainder of 57.
Record the quotient 3 as the next digit in the result. 
Result so far: 659026.3626373
If we subtract 273 from 330, we get 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Step 16:
If we divide 570 by 91, we get 6 and a remainder of 24.
Use 6 as the next digit of our solution. 
Result so far: 659026.36263736
The remainder is 24 after subtracting 546 from 570.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

In conclusion, the division gives 659026.36263736 with a balance of 2.4e-08.