We're dividing 638521 by 4 
Our goal is to divide 638521 by 4.

Going ahead to step 1:
6 divided by 4 is 1 with a remainder of 2.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 4 away from 6, we end up with 2.
Include the next digit (3) from the dividend after 2, then repeat: 23 / 4

Moving on to step 2:
The number 4 fits into 23 5 times, leaving a remainder of 3.
The next digit of our result is 5. 
Result so far: 15.0
Subtracting 20 from 23 leaves us with 3.
Take the next digit (8) from the dividend and append it to 3, then repeat: 38 / 4

Step 3:
When dividing 38 by 4, we get 9 with a remainder of 2.
Record the quotient 9 as the next digit in the result. 
Result so far: 159.0
The remainder is 2 after subtracting 36 from 38.
Append the next digit (5) from the dividend to 2 and continue with: 25 / 4

Advancing to step 4:
When dividing 25 by 4, we get 6 with a remainder of 1.
Write down 6 as next digit of the result. 
Result so far: 1596.0
Deduct 24 from 25 and we're left with 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 4

Going ahead to step 5:
4 can be fit into 12 3 times, resulting in a remainder of 0.
Record the quotient 3 as the next digit in the result. 
Result so far: 15963.0
If we subtract 12 from 12, we get 0.
Take the next digit (1) from the dividend and append it to 0, then repeat: 1 / 4

Advancing to step 6:
4 goes into 1 0 times with a remainder of 1.
The next digit of our result is 0. 
Result so far: 159630.0
If we take 0 away from 1, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 7:
4 can be fit into 10 2 times, resulting in a remainder of 2.
The number 2 becomes the next digit in our result. 
Result so far: 159630.2
The remainder is 2 after subtracting 8 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 8:
When dividing 20 by 4, we get 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 159630.25
If we take 20 away from 20, 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.

Going ahead to step 9:
4 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 159630.25
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.

Advancing to step 10:
The number 4 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 159630.25
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.

The final outcome is 159630.25, with a leftover of 0.0.