Let's divide 99973638 by 640
The aim is to understand the frequency of 640 in 99973638.

Step 1:
When dividing 9 by 640, we get 0 with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Take the next digit (9) from the dividend and append it to 9, then repeat: 99 / 640

Moving on to step 2:
When dividing 99 by 640, we get 0 with a remainder of 99.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 99, we end up with 99.
Grab the next digit (9) from the dividend, add it to 99, then carry on: 999 / 640

On to step 3:
640 goes into 999 1 times with a remainder of 359.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 640 from 999, we get 359.
Append the next digit (7) from the dividend to 359 and continue with: 3597 / 640

Moving on to step 4:
If we divide 3597 by 640, we get 5 and a remainder of 397.
Put 5 as the next digit of the answer. 
Result so far: 15.0
If we take 3200 away from 3597, we end up with 397.
Grab the next digit (3) from the dividend, add it to 397, then carry on: 3973 / 640

Moving on to step 5:
If we divide 3973 by 640, we get 6 and a remainder of 133.
Record the quotient 6 as the next digit in the result. 
Result so far: 156.0
If we take 3840 away from 3973, we end up with 133.
Include the next digit (6) from the dividend after 133, then repeat: 1336 / 640

Step 6:
640 can be fit into 1336 2 times, resulting in a remainder of 56.
Record the quotient 2 as the next digit in the result. 
Result so far: 1562.0
Subtracting 1280 from 1336 leaves us with 56.
Append the next digit (3) from the dividend to 56 and continue with: 563 / 640

Step 7:
640 goes into 563 0 times with a remainder of 563.
Put 0 as the next digit of the answer. 
Result so far: 15620.0
Subtract 0 from 563 to get 563.
Fetch the next digit (8) from the dividend, attach it to 563 and continue: 5638 / 640

On to step 8:
640 can be fit into 5638 8 times, resulting in a remainder of 518.
Write down 8 as next digit of the result. 
Result so far: 156208.0
The remainder is 518 after subtracting 5120 from 5638.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5180, and continue the process.

Let's proceed to step 9:
The number 640 fits into 5180 8 times, leaving a remainder of 60.
The number 8 becomes the next digit in our result. 
Result so far: 156208.8
Deduct 5120 from 5180 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 10:
When dividing 600 by 640, we get 0 with a remainder of 600.
Write down 0 as next digit of the result. 
Result so far: 156208.8
Subtract 0 from 600 to get 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

Advancing to step 11:
When dividing 6000 by 640, we get 9 with a remainder of 240.
Use 9 as the next digit of our solution. 
Result so far: 156208.809
The remainder is 240 after subtracting 5760 from 6000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Step 12:
640 can be fit into 2400 3 times, resulting in a remainder of 480.
Record the quotient 3 as the next digit in the result. 
Result so far: 156208.8093
Subtract 1920 from 2400 to get 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Advancing to step 13:
4800 divided by 640 is 7 with a remainder of 320.
Record the quotient 7 as the next digit in the result. 
Result so far: 156208.80937
If we subtract 4480 from 4800, we get 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 14:
The number 640 fits into 3200 5 times, leaving a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 156208.809375
If we subtract 3200 from 3200, we 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.

Advancing to step 15:
0 divided by 640 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 156208.809375
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.

Going ahead to step 16:
0 divided by 640 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 156208.809375
If we subtract 0 from 0, we 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.

In conclusion, the division gives 156208.809375 with a balance of 0.0.