We divide 971985 by 91
The aim is to understand the frequency of 91 in 971985.

Going ahead to step 1:
91 goes into 9 0 times with a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Take the next digit (7) from the dividend and append it to 9, then repeat: 97 / 91

Moving on to step 2:
97 divided by 91 is 1 with a remainder of 6.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 91 from 97, we get 6.
Append the next digit (1) from the dividend to 6 and continue with: 61 / 91

On to step 3:
91 goes into 61 0 times with a remainder of 61.
Use 0 as the next digit of our solution. 
Result so far: 10.0
The remainder is 61 after subtracting 0 from 61.
Include the next digit (9) from the dividend after 61, then repeat: 619 / 91

Let's proceed to step 4:
When dividing 619 by 91, we get 6 with a remainder of 73.
The next digit of our result is 6. 
Result so far: 106.0
The remainder is 73 after subtracting 546 from 619.
Append the next digit (8) from the dividend to 73 and continue with: 738 / 91

Moving on to step 5:
The number 91 fits into 738 8 times, leaving a remainder of 10.
The number 8 becomes the next digit in our result. 
Result so far: 1068.0
If we take 728 away from 738, we end up with 10.
Grab the next digit (5) from the dividend, add it to 10, then carry on: 105 / 91

On to step 6:
If we divide 105 by 91, we get 1 and a remainder of 14.
The next digit of our result is 1. 
Result so far: 10681.0
If we take 91 away from 105, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 7:
91 goes into 140 1 times with a remainder of 49.
The number 1 becomes the next digit in our result. 
Result so far: 10681.1
Subtract 91 from 140 to get 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

On to step 8:
When dividing 490 by 91, we get 5 with a remainder of 35.
Write down 5 as next digit of the result. 
Result so far: 10681.15
Deduct 455 from 490 and we're left with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Let's proceed to step 9:
When dividing 350 by 91, we get 3 with a remainder of 77.
Write down 3 as next digit of the result. 
Result so far: 10681.153
The remainder is 77 after subtracting 273 from 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

Going ahead to step 10:
If we divide 770 by 91, we get 8 and a remainder of 42.
The number 8 becomes the next digit in our result. 
Result so far: 10681.1538
Subtracting 728 from 770 leaves us with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 11:
If we divide 420 by 91, we get 4 and a remainder of 56.
Put 4 as the next digit of the answer. 
Result so far: 10681.15384
Subtracting 364 from 420 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Going ahead to step 12:
91 goes into 560 6 times with a remainder of 14.
Use 6 as the next digit of our solution. 
Result so far: 10681.153846
If we subtract 546 from 560, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 13:
91 goes into 140 1 times with a remainder of 49.
Write down 1 as next digit of the result. 
Result so far: 10681.1538461
If we subtract 91 from 140, we get 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Moving on to step 14:
490 divided by 91 is 5 with a remainder of 35.
Write down 5 as next digit of the result. 
Result so far: 10681.15384615
Deduct 455 from 490 and we're left with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

The final outcome is 10681.15384615, with a leftover of 3.5e-08.