Let's divide 73951569 by 638
The aim is to understand the frequency of 638 in 73951569.

On to step 1:
638 can be fit into 7 0 times, resulting in a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Take the next digit (3) from the dividend and append it to 7, then repeat: 73 / 638

Moving on to step 2:
638 goes into 73 0 times with a remainder of 73.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 73, we end up with 73.
Grab the next digit (9) from the dividend, add it to 73, then carry on: 739 / 638

Moving on to step 3:
If we divide 739 by 638, we get 1 and a remainder of 101.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 101 after subtracting 638 from 739.
Take the next digit (5) from the dividend and append it to 101, then repeat: 1015 / 638

Let's proceed to step 4:
The number 638 fits into 1015 1 times, leaving a remainder of 377.
Put 1 as the next digit of the answer. 
Result so far: 11.0
If we take 638 away from 1015, we end up with 377.
Fetch the next digit (1) from the dividend, attach it to 377 and continue: 3771 / 638

On to step 5:
When dividing 3771 by 638, we get 5 with a remainder of 581.
The number 5 becomes the next digit in our result. 
Result so far: 115.0
Deduct 3190 from 3771 and we're left with 581.
Bring next digit (5) of the dividend behind the 581 and repeat the process: 5815 / 638

Advancing to step 6:
If we divide 5815 by 638, we get 9 and a remainder of 73.
Record the quotient 9 as the next digit in the result. 
Result so far: 1159.0
If we take 5742 away from 5815, we end up with 73.
Fetch the next digit (6) from the dividend, attach it to 73 and continue: 736 / 638

Going ahead to step 7:
736 divided by 638 is 1 with a remainder of 98.
Use 1 as the next digit of our solution. 
Result so far: 11591.0
Subtracting 638 from 736 leaves us with 98.
Append the next digit (9) from the dividend to 98 and continue with: 989 / 638

Let's proceed to step 8:
When dividing 989 by 638, we get 1 with a remainder of 351.
The number 1 becomes the next digit in our result. 
Result so far: 115911.0
If we take 638 away from 989, we end up with 351.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3510, and continue the process.

Let's proceed to step 9:
638 goes into 3510 5 times with a remainder of 320.
Use 5 as the next digit of our solution. 
Result so far: 115911.5
If we subtract 3190 from 3510, 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.

Advancing to step 10:
When dividing 3200 by 638, we get 5 with a remainder of 10.
Use 5 as the next digit of our solution. 
Result so far: 115911.55
If we subtract 3190 from 3200, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final result is 115911.55 with a remainder of 0.01.