Let's divide 39950103 by 521
We want to divide 39950103 by 521.

Going ahead to step 1:
If we divide 3 by 521, we get 0 and a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Fetch the next digit (9) from the dividend, attach it to 3 and continue: 39 / 521

On to step 2:
When dividing 39 by 521, we get 0 with a remainder of 39.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 39, we get 39.
Include the next digit (9) from the dividend after 39, then repeat: 399 / 521

Advancing to step 3:
521 goes into 399 0 times with a remainder of 399.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 399 leaves us with 399.
Bring next digit (5) of the dividend behind the 399 and repeat the process: 3995 / 521

Let's proceed to step 4:
521 can be fit into 3995 7 times, resulting in a remainder of 348.
Put 7 as the next digit of the answer. 
Result so far: 7.0
Subtract 3647 from 3995 to get 348.
Take the next digit (0) from the dividend and append it to 348, then repeat: 3480 / 521

Step 5:
521 goes into 3480 6 times with a remainder of 354.
Record the quotient 6 as the next digit in the result. 
Result so far: 76.0
Subtracting 3126 from 3480 leaves us with 354.
Include the next digit (1) from the dividend after 354, then repeat: 3541 / 521

On to step 6:
The number 521 fits into 3541 6 times, leaving a remainder of 415.
Record the quotient 6 as the next digit in the result. 
Result so far: 766.0
If we subtract 3126 from 3541, we get 415.
Grab the next digit (0) from the dividend, add it to 415, then carry on: 4150 / 521

Step 7:
521 goes into 4150 7 times with a remainder of 503.
Use 7 as the next digit of our solution. 
Result so far: 7667.0
Deduct 3647 from 4150 and we're left with 503.
Bring next digit (3) of the dividend behind the 503 and repeat the process: 5033 / 521

Moving on to step 8:
5033 divided by 521 is 9 with a remainder of 344.
Use 9 as the next digit of our solution. 
Result so far: 76679.0
If we subtract 4689 from 5033, we get 344.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3440, and continue the process.

Going ahead to step 9:
When dividing 3440 by 521, we get 6 with a remainder of 314.
Write down 6 as next digit of the result. 
Result so far: 76679.6
Deduct 3126 from 3440 and we're left with 314.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3140, and continue the process.

On to step 10:
3140 divided by 521 is 6 with a remainder of 14.
The number 6 becomes the next digit in our result. 
Result so far: 76679.66
If we take 3126 away from 3140, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Our division results in 76679.66 with a remaining 0.014.