We look at the division of 30521501 by 638 
We're looking to find how many times 638 goes into 30521501.

Advancing to step 1:
638 can be fit into 3 0 times, resulting in a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Include the next digit (0) from the dividend after 3, then repeat: 30 / 638

Advancing to step 2:
If we divide 30 by 638, we get 0 and a remainder of 30.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 30 after subtracting 0 from 30.
Append the next digit (5) from the dividend to 30 and continue with: 305 / 638

Moving on to step 3:
If we divide 305 by 638, we get 0 and a remainder of 305.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 305, we get 305.
Take the next digit (2) from the dividend and append it to 305, then repeat: 3052 / 638

Advancing to step 4:
638 can be fit into 3052 4 times, resulting in a remainder of 500.
The next digit of our result is 4. 
Result so far: 4.0
Deduct 2552 from 3052 and we're left with 500.
Include the next digit (1) from the dividend after 500, then repeat: 5001 / 638

Step 5:
638 goes into 5001 7 times with a remainder of 535.
Put 7 as the next digit of the answer. 
Result so far: 47.0
Subtracting 4466 from 5001 leaves us with 535.
Take the next digit (5) from the dividend and append it to 535, then repeat: 5355 / 638

Step 6:
The number 638 fits into 5355 8 times, leaving a remainder of 251.
Put 8 as the next digit of the answer. 
Result so far: 478.0
Deduct 5104 from 5355 and we're left with 251.
Include the next digit (0) from the dividend after 251, then repeat: 2510 / 638

Let's proceed to step 7:
The number 638 fits into 2510 3 times, leaving a remainder of 596.
Write down 3 as next digit of the result. 
Result so far: 4783.0
Subtract 1914 from 2510 to get 596.
Grab the next digit (1) from the dividend, add it to 596, then carry on: 5961 / 638

On to step 8:
638 can be fit into 5961 9 times, resulting in a remainder of 219.
Use 9 as the next digit of our solution. 
Result so far: 47839.0
Subtracting 5742 from 5961 leaves us with 219.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2190, and continue the process.

On to step 9:
638 can be fit into 2190 3 times, resulting in a remainder of 276.
The number 3 becomes the next digit in our result. 
Result so far: 47839.3
If we subtract 1914 from 2190, we get 276.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2760, and continue the process.

Advancing to step 10:
2760 divided by 638 is 4 with a remainder of 208.
Use 4 as the next digit of our solution. 
Result so far: 47839.34
Subtracting 2552 from 2760 leaves us with 208.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

On to step 11:
638 goes into 2080 3 times with a remainder of 166.
The next digit of our result is 3. 
Result so far: 47839.343
If we subtract 1914 from 2080, we get 166.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1660, and continue the process.

Advancing to step 12:
When dividing 1660 by 638, we get 2 with a remainder of 384.
Write down 2 as next digit of the result. 
Result so far: 47839.3432
If we subtract 1276 from 1660, we get 384.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3840, and continue the process.

Step 13:
3840 divided by 638 is 6 with a remainder of 12.
The next digit of our result is 6. 
Result so far: 47839.34326
Subtracting 3828 from 3840 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 14:
638 goes into 120 0 times with a remainder of 120.
Record the quotient 0 as the next digit in the result. 
Result so far: 47839.34326
Subtracting 0 from 120 leaves us with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Advancing to step 15:
1200 divided by 638 is 1 with a remainder of 562.
Write down 1 as next digit of the result. 
Result so far: 47839.3432601
If we subtract 638 from 1200, we get 562.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5620, and continue the process.

Advancing to step 16:
5620 divided by 638 is 8 with a remainder of 516.
Put 8 as the next digit of the answer. 
Result so far: 47839.34326018
If we take 5104 away from 5620, we end up with 516.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5160, and continue the process.

The quotient of the division is 47839.34326018, and the remainder is 5.16e-07.