Let's divide 20066810 by 644
The aim is to understand the frequency of 644 in 20066810.

Let's proceed to step 1:
644 can be fit into 2 0 times, resulting in a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Fetch the next digit (0) from the dividend, attach it to 2 and continue: 20 / 644

Let's proceed to step 2:
When dividing 20 by 644, we get 0 with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 20 leaves us with 20.
Fetch the next digit (0) from the dividend, attach it to 20 and continue: 200 / 644

Let's proceed to step 3:
644 goes into 200 0 times with a remainder of 200.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 200 and we're left with 200.
Include the next digit (6) from the dividend after 200, then repeat: 2006 / 644

Going ahead to step 4:
When dividing 2006 by 644, we get 3 with a remainder of 74.
Write down 3 as next digit of the result. 
Result so far: 3.0
If we subtract 1932 from 2006, we get 74.
Fetch the next digit (6) from the dividend, attach it to 74 and continue: 746 / 644

Step 5:
644 can be fit into 746 1 times, resulting in a remainder of 102.
The next digit of our result is 1. 
Result so far: 31.0
Subtracting 644 from 746 leaves us with 102.
Grab the next digit (8) from the dividend, add it to 102, then carry on: 1028 / 644

Advancing to step 6:
644 can be fit into 1028 1 times, resulting in a remainder of 384.
Put 1 as the next digit of the answer. 
Result so far: 311.0
The remainder is 384 after subtracting 644 from 1028.
Fetch the next digit (1) from the dividend, attach it to 384 and continue: 3841 / 644

Moving on to step 7:
644 goes into 3841 5 times with a remainder of 621.
The next digit of our result is 5. 
Result so far: 3115.0
The remainder is 621 after subtracting 3220 from 3841.
Include the next digit (0) from the dividend after 621, then repeat: 6210 / 644

On to step 8:
644 can be fit into 6210 9 times, resulting in a remainder of 414.
The number 9 becomes the next digit in our result. 
Result so far: 31159.0
Deduct 5796 from 6210 and we're left with 414.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4140, and continue the process.

Let's proceed to step 9:
The number 644 fits into 4140 6 times, leaving a remainder of 276.
Use 6 as the next digit of our solution. 
Result so far: 31159.6
Subtracting 3864 from 4140 leaves us with 276.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2760, and continue the process.

Let's proceed to step 10:
The number 644 fits into 2760 4 times, leaving a remainder of 184.
The number 4 becomes the next digit in our result. 
Result so far: 31159.64
Subtract 2576 from 2760 to get 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

Moving on to step 11:
The number 644 fits into 1840 2 times, leaving a remainder of 552.
Write down 2 as next digit of the result. 
Result so far: 31159.642
The remainder is 552 after subtracting 1288 from 1840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5520, and continue the process.

Let's proceed to step 12:
5520 divided by 644 is 8 with a remainder of 368.
The number 8 becomes the next digit in our result. 
Result so far: 31159.6428
If we subtract 5152 from 5520, we get 368.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3680, and continue the process.

Advancing to step 13:
3680 divided by 644 is 5 with a remainder of 460.
Put 5 as the next digit of the answer. 
Result so far: 31159.64285
Subtract 3220 from 3680 to get 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

Moving on to step 14:
644 can be fit into 4600 7 times, resulting in a remainder of 92.
Write down 7 as next digit of the result. 
Result so far: 31159.642857
Subtracting 4508 from 4600 leaves us with 92.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

Let's proceed to step 15:
The number 644 fits into 920 1 times, leaving a remainder of 276.
Record the quotient 1 as the next digit in the result. 
Result so far: 31159.6428571
Subtract 644 from 920 to get 276.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2760, and continue the process.

Going ahead to step 16:
644 goes into 2760 4 times with a remainder of 184.
Record the quotient 4 as the next digit in the result. 
Result so far: 31159.64285714
Subtracting 2576 from 2760 leaves us with 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

The final result is 31159.64285714 with a remainder of 1.84e-07.