564840 divided by 91 
The aim is to understand the frequency of 91 in 564840.

On to step 1:
5 divided by 91 is 0 with 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.
Append the next digit (6) from the dividend to 5 and continue with: 56 / 91

Step 2:
When dividing 56 by 91, we get 0 with a remainder of 56.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 56 to get 56.
Take the next digit (4) from the dividend and append it to 56, then repeat: 564 / 91

Step 3:
564 divided by 91 is 6 with a remainder of 18.
Use 6 as the next digit of our solution. 
Result so far: 6.0
If we take 546 away from 564, we end up with 18.
Append the next digit (8) from the dividend to 18 and continue with: 188 / 91

Going ahead to step 4:
If we divide 188 by 91, we get 2 and a remainder of 6.
The next digit of our result is 2. 
Result so far: 62.0
The remainder is 6 after subtracting 182 from 188.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 91

Let's proceed to step 5:
If we divide 64 by 91, we get 0 and a remainder of 64.
The next digit of our result is 0. 
Result so far: 620.0
Deduct 0 from 64 and we're left with 64.
Append the next digit (0) from the dividend to 64 and continue with: 640 / 91

Going ahead to step 6:
The number 91 fits into 640 7 times, leaving a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 6207.0
If we take 637 away from 640, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 7:
If we divide 30 by 91, we get 0 and a remainder of 30.
Record the quotient 0 as the next digit in the result. 
Result so far: 6207.0
Subtract 0 from 30 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 8:
300 divided by 91 is 3 with a remainder of 27.
Write down 3 as next digit of the result. 
Result so far: 6207.03
If we take 273 away from 300, we end up with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Advancing to step 9:
The number 91 fits into 270 2 times, leaving a remainder of 88.
Use 2 as the next digit of our solution. 
Result so far: 6207.032
The remainder is 88 after subtracting 182 from 270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Let's proceed to step 10:
The number 91 fits into 880 9 times, leaving a remainder of 61.
Record the quotient 9 as the next digit in the result. 
Result so far: 6207.0329
Subtracting 819 from 880 leaves us with 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Moving on to step 11:
91 can be fit into 610 6 times, resulting in a remainder of 64.
Record the quotient 6 as the next digit in the result. 
Result so far: 6207.03296
If we take 546 away from 610, we end up with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Let's proceed to step 12:
640 divided by 91 is 7 with a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 6207.032967
Subtracting 637 from 640 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 13:
91 can be fit into 30 0 times, resulting in a remainder of 30.
Record the quotient 0 as the next digit in the result. 
Result so far: 6207.032967
If we subtract 0 from 30, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 14:
The number 91 fits into 300 3 times, leaving a remainder of 27.
Write down 3 as next digit of the result. 
Result so far: 6207.03296703
Subtract 273 from 300 to get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

The quotient of the division is 6207.03296703, and the remainder is 2.7e-08.