15193925 ÷ 521 
Our goal is to divide 15193925 by 521.

On to step 1:
521 goes into 1 0 times with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 521

Going ahead to step 2:
The number 521 fits into 15 0 times, leaving a remainder of 15.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 15 after subtracting 0 from 15.
Fetch the next digit (1) from the dividend, attach it to 15 and continue: 151 / 521

Let's proceed to step 3:
521 goes into 151 0 times with a remainder of 151.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 151 after subtracting 0 from 151.
Include the next digit (9) from the dividend after 151, then repeat: 1519 / 521

Moving on to step 4:
521 goes into 1519 2 times with a remainder of 477.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we take 1042 away from 1519, we end up with 477.
Take the next digit (3) from the dividend and append it to 477, then repeat: 4773 / 521

Going ahead to step 5:
4773 divided by 521 is 9 with a remainder of 84.
Use 9 as the next digit of our solution. 
Result so far: 29.0
If we take 4689 away from 4773, we end up with 84.
Include the next digit (9) from the dividend after 84, then repeat: 849 / 521

On to step 6:
If we divide 849 by 521, we get 1 and a remainder of 328.
The next digit of our result is 1. 
Result so far: 291.0
Subtracting 521 from 849 leaves us with 328.
Fetch the next digit (2) from the dividend, attach it to 328 and continue: 3282 / 521

Moving on to step 7:
When dividing 3282 by 521, we get 6 with a remainder of 156.
Record the quotient 6 as the next digit in the result. 
Result so far: 2916.0
If we subtract 3126 from 3282, we get 156.
Append the next digit (5) from the dividend to 156 and continue with: 1565 / 521

Going ahead to step 8:
If we divide 1565 by 521, we get 3 and a remainder of 2.
Put 3 as the next digit of the answer. 
Result so far: 29163.0
Deduct 1563 from 1565 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 9:
521 goes into 20 0 times with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 29163.0
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 10:
If we divide 200 by 521, we get 0 and a remainder of 200.
The next digit of our result is 0. 
Result so far: 29163.0
If we subtract 0 from 200, we get 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

The final outcome is 29163.0, with a leftover of 0.2.