777658 ÷ 91 
The aim is to understand the frequency of 91 in 777658.

Let's proceed to step 1:
If we divide 7 by 91, we get 0 and a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Fetch the next digit (7) from the dividend, attach it to 7 and continue: 77 / 91

Advancing to step 2:
91 can be fit into 77 0 times, resulting in a remainder of 77.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 77, we end up with 77.
Append the next digit (7) from the dividend to 77 and continue with: 777 / 91

Step 3:
The number 91 fits into 777 8 times, leaving a remainder of 49.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
If we subtract 728 from 777, we get 49.
Fetch the next digit (6) from the dividend, attach it to 49 and continue: 496 / 91

Going ahead to step 4:
When dividing 496 by 91, we get 5 with a remainder of 41.
The next digit of our result is 5. 
Result so far: 85.0
Subtracting 455 from 496 leaves us with 41.
Bring next digit (5) of the dividend behind the 41 and repeat the process: 415 / 91

Going ahead to step 5:
91 goes into 415 4 times with a remainder of 51.
The number 4 becomes the next digit in our result. 
Result so far: 854.0
Subtract 364 from 415 to get 51.
Fetch the next digit (8) from the dividend, attach it to 51 and continue: 518 / 91

Step 6:
When dividing 518 by 91, we get 5 with a remainder of 63.
Put 5 as the next digit of the answer. 
Result so far: 8545.0
If we take 455 away from 518, we end up with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Advancing to step 7:
91 can be fit into 630 6 times, resulting in a remainder of 84.
Put 6 as the next digit of the answer. 
Result so far: 8545.6
If we subtract 546 from 630, we get 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Step 8:
91 can be fit into 840 9 times, resulting in a remainder of 21.
Use 9 as the next digit of our solution. 
Result so far: 8545.69
If we take 819 away from 840, we end up with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Going ahead to step 9:
If we divide 210 by 91, we get 2 and a remainder of 28.
The next digit of our result is 2. 
Result so far: 8545.692
Subtract 182 from 210 to get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Going ahead to step 10:
91 can be fit into 280 3 times, resulting in a remainder of 7.
Put 3 as the next digit of the answer. 
Result so far: 8545.6923
Subtract 273 from 280 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 11:
91 goes into 70 0 times with a remainder of 70.
The next digit of our result is 0. 
Result so far: 8545.6923
If we subtract 0 from 70, we get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Step 12:
The number 91 fits into 700 7 times, leaving a remainder of 63.
Put 7 as the next digit of the answer. 
Result so far: 8545.692307
If we subtract 637 from 700, we get 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

On to step 13:
When dividing 630 by 91, we get 6 with a remainder of 84.
Record the quotient 6 as the next digit in the result. 
Result so far: 8545.6923076
The remainder is 84 after subtracting 546 from 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Moving on to step 14:
91 can be fit into 840 9 times, resulting in a remainder of 21.
The number 9 becomes the next digit in our result. 
Result so far: 8545.69230769
The remainder is 21 after subtracting 819 from 840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

The final outcome is 8545.69230769, with a leftover of 2.1e-08.