We're dividing 18693544 by 640 
The aim is to understand the frequency of 640 in 18693544.

On to step 1:
If we divide 1 by 640, we get 0 and a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Grab the next digit (8) from the dividend, add it to 1, then carry on: 18 / 640

Going ahead to step 2:
The number 640 fits into 18 0 times, leaving a remainder of 18.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 18 after subtracting 0 from 18.
Append the next digit (6) from the dividend to 18 and continue with: 186 / 640

Let's proceed to step 3:
186 divided by 640 is 0 with a remainder of 186.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 186 leaves us with 186.
Append the next digit (9) from the dividend to 186 and continue with: 1869 / 640

Moving on to step 4:
If we divide 1869 by 640, we get 2 and a remainder of 589.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Deduct 1280 from 1869 and we're left with 589.
Include the next digit (3) from the dividend after 589, then repeat: 5893 / 640

Moving on to step 5:
If we divide 5893 by 640, we get 9 and a remainder of 133.
Write down 9 as next digit of the result. 
Result so far: 29.0
If we subtract 5760 from 5893, we get 133.
Append the next digit (5) from the dividend to 133 and continue with: 1335 / 640

Step 6:
640 goes into 1335 2 times with a remainder of 55.
Write down 2 as next digit of the result. 
Result so far: 292.0
Deduct 1280 from 1335 and we're left with 55.
Take the next digit (4) from the dividend and append it to 55, then repeat: 554 / 640

Advancing to step 7:
The number 640 fits into 554 0 times, leaving a remainder of 554.
Put 0 as the next digit of the answer. 
Result so far: 2920.0
Subtracting 0 from 554 leaves us with 554.
Bring next digit (4) of the dividend behind the 554 and repeat the process: 5544 / 640

Step 8:
5544 divided by 640 is 8 with a remainder of 424.
The next digit of our result is 8. 
Result so far: 29208.0
Subtracting 5120 from 5544 leaves us with 424.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4240, and continue the process.

Going ahead to step 9:
When dividing 4240 by 640, we get 6 with a remainder of 400.
Put 6 as the next digit of the answer. 
Result so far: 29208.6
Subtract 3840 from 4240 to get 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Moving on to step 10:
When dividing 4000 by 640, we get 6 with a remainder of 160.
Use 6 as the next digit of our solution. 
Result so far: 29208.66
If we take 3840 away from 4000, we end up with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

The final outcome is 29208.66, with a leftover of 0.16.