644640 divided by 93 
The aim is to understand the frequency of 93 in 644640.

On to step 1:
93 goes into 6 0 times with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 93

On to step 2:
The number 93 fits into 64 0 times, leaving a remainder of 64.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 64 leaves us with 64.
Grab the next digit (4) from the dividend, add it to 64, then carry on: 644 / 93

Step 3:
The number 93 fits into 644 6 times, leaving a remainder of 86.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
The remainder is 86 after subtracting 558 from 644.
Grab the next digit (6) from the dividend, add it to 86, then carry on: 866 / 93

Let's proceed to step 4:
If we divide 866 by 93, we get 9 and a remainder of 29.
The number 9 becomes the next digit in our result. 
Result so far: 69.0
Subtract 837 from 866 to get 29.
Append the next digit (4) from the dividend to 29 and continue with: 294 / 93

Step 5:
If we divide 294 by 93, we get 3 and a remainder of 15.
Write down 3 as next digit of the result. 
Result so far: 693.0
Subtract 279 from 294 to get 15.
Append the next digit (0) from the dividend to 15 and continue with: 150 / 93

Moving on to step 6:
93 can be fit into 150 1 times, resulting in a remainder of 57.
Write down 1 as next digit of the result. 
Result so far: 6931.0
Deduct 93 from 150 and we're left with 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Moving on to step 7:
The number 93 fits into 570 6 times, leaving a remainder of 12.
The number 6 becomes the next digit in our result. 
Result so far: 6931.6
Deduct 558 from 570 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 8:
If we divide 120 by 93, we get 1 and a remainder of 27.
Use 1 as the next digit of our solution. 
Result so far: 6931.61
If we take 93 away from 120, 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:
When dividing 270 by 93, we get 2 with a remainder of 84.
Use 2 as the next digit of our solution. 
Result so far: 6931.612
Deduct 186 from 270 and we're left with 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 10:
When dividing 840 by 93, we get 9 with a remainder of 3.
Use 9 as the next digit of our solution. 
Result so far: 6931.6129
The remainder is 3 after subtracting 837 from 840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 11:
93 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: 6931.6129
Deduct 0 from 30 and we're left with 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 12:
If we divide 300 by 93, we get 3 and a remainder of 21.
Put 3 as the next digit of the answer. 
Result so far: 6931.612903
Subtract 279 from 300 to get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Let's proceed to step 13:
The number 93 fits into 210 2 times, leaving a remainder of 24.
Write down 2 as next digit of the result. 
Result so far: 6931.6129032
If we subtract 186 from 210, we get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 14:
240 divided by 93 is 2 with a remainder of 54.
The next digit of our result is 2. 
Result so far: 6931.61290322
Deduct 186 from 240 and we're left with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

The final result is 6931.61290322 with a remainder of 5.4e-08.