63899976 ÷ 640 
The aim is to understand the frequency of 640 in 63899976.

Going ahead to step 1:
6 divided by 640 is 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 640

Going ahead to step 2:
63 divided by 640 is 0 with a remainder of 63.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 63, we end up with 63.
Fetch the next digit (8) from the dividend, attach it to 63 and continue: 638 / 640

Let's proceed to step 3:
640 can be fit into 638 0 times, resulting in a remainder of 638.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 638, we end up with 638.
Take the next digit (9) from the dividend and append it to 638, then repeat: 6389 / 640

Moving on to step 4:
If we divide 6389 by 640, we get 9 and a remainder of 629.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
If we subtract 5760 from 6389, we get 629.
Bring next digit (9) of the dividend behind the 629 and repeat the process: 6299 / 640

Going ahead to step 5:
640 goes into 6299 9 times with a remainder of 539.
Record the quotient 9 as the next digit in the result. 
Result so far: 99.0
If we subtract 5760 from 6299, we get 539.
Grab the next digit (9) from the dividend, add it to 539, then carry on: 5399 / 640

Going ahead to step 6:
The number 640 fits into 5399 8 times, leaving a remainder of 279.
The number 8 becomes the next digit in our result. 
Result so far: 998.0
Deduct 5120 from 5399 and we're left with 279.
Append the next digit (7) from the dividend to 279 and continue with: 2797 / 640

On to step 7:
If we divide 2797 by 640, we get 4 and a remainder of 237.
The number 4 becomes the next digit in our result. 
Result so far: 9984.0
If we take 2560 away from 2797, we end up with 237.
Grab the next digit (6) from the dividend, add it to 237, then carry on: 2376 / 640

On to step 8:
640 can be fit into 2376 3 times, resulting in a remainder of 456.
Put 3 as the next digit of the answer. 
Result so far: 99843.0
If we take 1920 away from 2376, we end up with 456.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4560, and continue the process.

Let's proceed to step 9:
4560 divided by 640 is 7 with a remainder of 80.
The next digit of our result is 7. 
Result so far: 99843.7
The remainder is 80 after subtracting 4480 from 4560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Advancing to step 10:
The number 640 fits into 800 1 times, leaving a remainder of 160.
The next digit of our result is 1. 
Result so far: 99843.71
Subtract 640 from 800 to get 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

On to step 11:
If we divide 1600 by 640, we get 2 and a remainder of 320.
The next digit of our result is 2. 
Result so far: 99843.712
If we take 1280 away from 1600, we end up with 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Step 12:
When dividing 3200 by 640, we get 5 with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 99843.7125
If we take 3200 away from 3200, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 13:
640 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 99843.7125
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 14:
When dividing 0 by 640, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 99843.7125
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 99843.7125 with a remaining 0.0.