586218 divided by 91 
The aim is to understand the frequency of 91 in 586218.

Moving on to step 1:
The number 91 fits into 5 0 times, leaving a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Grab the next digit (8) from the dividend, add it to 5, then carry on: 58 / 91

Moving on to step 2:
When dividing 58 by 91, we get 0 with a remainder of 58.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 58, we get 58.
Include the next digit (6) from the dividend after 58, then repeat: 586 / 91

Moving on to step 3:
If we divide 586 by 91, we get 6 and a remainder of 40.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
The remainder is 40 after subtracting 546 from 586.
Append the next digit (2) from the dividend to 40 and continue with: 402 / 91

Step 4:
402 divided by 91 is 4 with a remainder of 38.
The next digit of our result is 4. 
Result so far: 64.0
Subtract 364 from 402 to get 38.
Append the next digit (1) from the dividend to 38 and continue with: 381 / 91

Moving on to step 5:
381 divided by 91 is 4 with a remainder of 17.
The number 4 becomes the next digit in our result. 
Result so far: 644.0
Subtract 364 from 381 to get 17.
Include the next digit (8) from the dividend after 17, then repeat: 178 / 91

Moving on to step 6:
91 can be fit into 178 1 times, resulting in a remainder of 87.
Record the quotient 1 as the next digit in the result. 
Result so far: 6441.0
Deduct 91 from 178 and we're left with 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Going ahead to step 7:
91 can be fit into 870 9 times, resulting in a remainder of 51.
The next digit of our result is 9. 
Result so far: 6441.9
The remainder is 51 after subtracting 819 from 870.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Step 8:
91 can be fit into 510 5 times, resulting in a remainder of 55.
Use 5 as the next digit of our solution. 
Result so far: 6441.95
The remainder is 55 after subtracting 455 from 510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Advancing to step 9:
The number 91 fits into 550 6 times, leaving a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 6441.956
The remainder is 4 after subtracting 546 from 550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 10:
When dividing 40 by 91, we get 0 with a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 6441.956
Subtracting 0 from 40 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 11:
91 goes into 400 4 times with a remainder of 36.
The next digit of our result is 4. 
Result so far: 6441.95604
Deduct 364 from 400 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Step 12:
91 goes into 360 3 times with a remainder of 87.
Use 3 as the next digit of our solution. 
Result so far: 6441.956043
Deduct 273 from 360 and we're left with 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Moving on to step 13:
The number 91 fits into 870 9 times, leaving a remainder of 51.
Write down 9 as next digit of the result. 
Result so far: 6441.9560439
Deduct 819 from 870 and we're left with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Advancing to step 14:
The number 91 fits into 510 5 times, leaving a remainder of 55.
The number 5 becomes the next digit in our result. 
Result so far: 6441.95604395
If we take 455 away from 510, we end up with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

The final outcome is 6441.95604395, with a leftover of 5.5e-08.