521499 ÷ 15 
Our goal is to divide 521499 by 15.

Step 1:
If we divide 5 by 15, we get 0 and a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Grab the next digit (2) from the dividend, add it to 5, then carry on: 52 / 15

Let's proceed to step 2:
15 can be fit into 52 3 times, resulting in a remainder of 7.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
The remainder is 7 after subtracting 45 from 52.
Fetch the next digit (1) from the dividend, attach it to 7 and continue: 71 / 15

Step 3:
15 goes into 71 4 times with a remainder of 11.
Put 4 as the next digit of the answer. 
Result so far: 34.0
If we take 60 away from 71, we end up with 11.
Include the next digit (4) from the dividend after 11, then repeat: 114 / 15

Moving on to step 4:
114 divided by 15 is 7 with a remainder of 9.
Put 7 as the next digit of the answer. 
Result so far: 347.0
The remainder is 9 after subtracting 105 from 114.
Include the next digit (9) from the dividend after 9, then repeat: 99 / 15

Going ahead to step 5:
99 divided by 15 is 6 with a remainder of 9.
Use 6 as the next digit of our solution. 
Result so far: 3476.0
Deduct 90 from 99 and we're left with 9.
Take the next digit (9) from the dividend and append it to 9, then repeat: 99 / 15

Going ahead to step 6:
If we divide 99 by 15, we get 6 and a remainder of 9.
The next digit of our result is 6. 
Result so far: 34766.0
Subtracting 90 from 99 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 7:
When dividing 90 by 15, we get 6 with a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 34766.6
Subtract 90 from 90 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.

Step 8:
If we divide 0 by 15, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 34766.6
Subtracting 0 from 0 leaves us 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.

On to step 9:
When dividing 0 by 15, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 34766.6
Subtracting 0 from 0 leaves us 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.

The final outcome is 34766.6, with a leftover of 0.0.