We're dividing 50416388 by 638 
The aim is to understand the frequency of 638 in 50416388.

On to step 1:
5 divided by 638 is 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Append the next digit (0) from the dividend to 5 and continue with: 50 / 638

Moving on to step 2:
When dividing 50 by 638, we get 0 with a remainder of 50.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 50 to get 50.
Take the next digit (4) from the dividend and append it to 50, then repeat: 504 / 638

On to step 3:
When dividing 504 by 638, we get 0 with a remainder of 504.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 504 leaves us with 504.
Take the next digit (1) from the dividend and append it to 504, then repeat: 5041 / 638

Step 4:
638 goes into 5041 7 times with a remainder of 575.
Use 7 as the next digit of our solution. 
Result so far: 7.0
If we subtract 4466 from 5041, we get 575.
Append the next digit (6) from the dividend to 575 and continue with: 5756 / 638

Step 5:
638 goes into 5756 9 times with a remainder of 14.
Record the quotient 9 as the next digit in the result. 
Result so far: 79.0
The remainder is 14 after subtracting 5742 from 5756.
Append the next digit (3) from the dividend to 14 and continue with: 143 / 638

Advancing to step 6:
638 goes into 143 0 times with a remainder of 143.
Use 0 as the next digit of our solution. 
Result so far: 790.0
If we subtract 0 from 143, we get 143.
Append the next digit (8) from the dividend to 143 and continue with: 1438 / 638

Advancing to step 7:
1438 divided by 638 is 2 with a remainder of 162.
Record the quotient 2 as the next digit in the result. 
Result so far: 7902.0
If we subtract 1276 from 1438, we get 162.
Bring next digit (8) of the dividend behind the 162 and repeat the process: 1628 / 638

Advancing to step 8:
If we divide 1628 by 638, we get 2 and a remainder of 352.
The number 2 becomes the next digit in our result. 
Result so far: 79022.0
The remainder is 352 after subtracting 1276 from 1628.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

Advancing to step 9:
3520 divided by 638 is 5 with a remainder of 330.
The next digit of our result is 5. 
Result so far: 79022.5
If we take 3190 away from 3520, we end up with 330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3300, and continue the process.

Step 10:
638 goes into 3300 5 times with a remainder of 110.
Write down 5 as next digit of the result. 
Result so far: 79022.55
If we subtract 3190 from 3300, we get 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Our division results in 79022.55 with a remaining 0.11.