802415 divided by 91 
The aim is to understand the frequency of 91 in 802415.

On to step 1:
If we divide 8 by 91, we get 0 and a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Fetch the next digit (0) from the dividend, attach it to 8 and continue: 80 / 91

Advancing to step 2:
When dividing 80 by 91, we get 0 with a remainder of 80.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 80 after subtracting 0 from 80.
Include the next digit (2) from the dividend after 80, then repeat: 802 / 91

Going ahead to step 3:
The number 91 fits into 802 8 times, leaving a remainder of 74.
Put 8 as the next digit of the answer. 
Result so far: 8.0
Subtracting 728 from 802 leaves us with 74.
Take the next digit (4) from the dividend and append it to 74, then repeat: 744 / 91

Advancing to step 4:
91 goes into 744 8 times with a remainder of 16.
Record the quotient 8 as the next digit in the result. 
Result so far: 88.0
The remainder is 16 after subtracting 728 from 744.
Fetch the next digit (1) from the dividend, attach it to 16 and continue: 161 / 91

On to step 5:
The number 91 fits into 161 1 times, leaving a remainder of 70.
Record the quotient 1 as the next digit in the result. 
Result so far: 881.0
Deduct 91 from 161 and we're left with 70.
Include the next digit (5) from the dividend after 70, then repeat: 705 / 91

Step 6:
91 goes into 705 7 times with a remainder of 68.
The next digit of our result is 7. 
Result so far: 8817.0
If we subtract 637 from 705, we get 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Moving on to step 7:
680 divided by 91 is 7 with a remainder of 43.
Record the quotient 7 as the next digit in the result. 
Result so far: 8817.7
If we subtract 637 from 680, we get 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Moving on to step 8:
91 can be fit into 430 4 times, resulting in a remainder of 66.
The number 4 becomes the next digit in our result. 
Result so far: 8817.74
If we take 364 away from 430, we end up with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Going ahead to step 9:
91 goes into 660 7 times with a remainder of 23.
Put 7 as the next digit of the answer. 
Result so far: 8817.747
If we take 637 away from 660, we end up with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Moving on to step 10:
If we divide 230 by 91, we get 2 and a remainder of 48.
Record the quotient 2 as the next digit in the result. 
Result so far: 8817.7472
If we take 182 away from 230, we end up with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Step 11:
When dividing 480 by 91, we get 5 with a remainder of 25.
Record the quotient 5 as the next digit in the result. 
Result so far: 8817.74725
Subtracting 455 from 480 leaves us with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Going ahead to step 12:
When dividing 250 by 91, we get 2 with a remainder of 68.
The number 2 becomes the next digit in our result. 
Result so far: 8817.747252
If we subtract 182 from 250, we get 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Let's proceed to step 13:
680 divided by 91 is 7 with a remainder of 43.
Record the quotient 7 as the next digit in the result. 
Result so far: 8817.7472527
Subtracting 637 from 680 leaves us with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

On to step 14:
When dividing 430 by 91, we get 4 with a remainder of 66.
Put 4 as the next digit of the answer. 
Result so far: 8817.74725274
The remainder is 66 after subtracting 364 from 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

The quotient of the division is 8817.74725274, and the remainder is 6.6e-08.