We divide 644666 by 65
The aim is to understand the frequency of 65 in 644666.

Let's proceed to step 1:
65 can be fit into 6 0 times, resulting in a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 65

On to step 2:
64 divided by 65 is 0 with a remainder of 64.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 64 and we're left with 64.
Fetch the next digit (4) from the dividend, attach it to 64 and continue: 644 / 65

Going ahead to step 3:
644 divided by 65 is 9 with a remainder of 59.
Write down 9 as next digit of the result. 
Result so far: 9.0
The remainder is 59 after subtracting 585 from 644.
Take the next digit (6) from the dividend and append it to 59, then repeat: 596 / 65

Step 4:
If we divide 596 by 65, we get 9 and a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 99.0
If we take 585 away from 596, we end up with 11.
Include the next digit (6) from the dividend after 11, then repeat: 116 / 65

Step 5:
65 can be fit into 116 1 times, resulting in a remainder of 51.
Use 1 as the next digit of our solution. 
Result so far: 991.0
Subtract 65 from 116 to get 51.
Include the next digit (6) from the dividend after 51, then repeat: 516 / 65

Going ahead to step 6:
When dividing 516 by 65, we get 7 with a remainder of 61.
Put 7 as the next digit of the answer. 
Result so far: 9917.0
Deduct 455 from 516 and we're left 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.

Going ahead to step 7:
When dividing 610 by 65, we get 9 with a remainder of 25.
The number 9 becomes the next digit in our result. 
Result so far: 9917.9
If we take 585 away from 610, we end up 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.

Step 8:
65 can be fit into 250 3 times, resulting in a remainder of 55.
Use 3 as the next digit of our solution. 
Result so far: 9917.93
Subtract 195 from 250 to get 55.
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:
65 can be fit into 550 8 times, resulting in a remainder of 30.
The number 8 becomes the next digit in our result. 
Result so far: 9917.938
The remainder is 30 after subtracting 520 from 550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 10:
300 divided by 65 is 4 with a remainder of 40.
Write down 4 as next digit of the result. 
Result so far: 9917.9384
Subtracting 260 from 300 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.

Moving on to step 11:
65 can be fit into 400 6 times, resulting in a remainder of 10.
Use 6 as the next digit of our solution. 
Result so far: 9917.93846
Deduct 390 from 400 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 12:
If we divide 100 by 65, we get 1 and a remainder of 35.
Use 1 as the next digit of our solution. 
Result so far: 9917.938461
If we subtract 65 from 100, we get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Step 13:
65 goes into 350 5 times with a remainder of 25.
Put 5 as the next digit of the answer. 
Result so far: 9917.9384615
Subtracting 325 from 350 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.

Advancing to step 14:
65 goes into 250 3 times with a remainder of 55.
Use 3 as the next digit of our solution. 
Result so far: 9917.93846153
Subtract 195 from 250 to get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Our division results in 9917.93846153 with a remaining 5.5e-08.