We look at the division of 12390353 by 505 
We want to figure out the number of times 12390353 can be divided by 505.

Let's proceed to step 1:
505 can be fit into 1 0 times, resulting in a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 505

Moving on to step 2:
12 divided by 505 is 0 with a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 12 leaves us with 12.
Include the next digit (3) from the dividend after 12, then repeat: 123 / 505

Moving on to step 3:
The number 505 fits into 123 0 times, leaving a remainder of 123.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 123, we end up with 123.
Fetch the next digit (9) from the dividend, attach it to 123 and continue: 1239 / 505

Let's proceed to step 4:
1239 divided by 505 is 2 with a remainder of 229.
The next digit of our result is 2. 
Result so far: 2.0
If we subtract 1010 from 1239, we get 229.
Grab the next digit (0) from the dividend, add it to 229, then carry on: 2290 / 505

Moving on to step 5:
If we divide 2290 by 505, we get 4 and a remainder of 270.
The next digit of our result is 4. 
Result so far: 24.0
Subtract 2020 from 2290 to get 270.
Bring next digit (3) of the dividend behind the 270 and repeat the process: 2703 / 505

On to step 6:
When dividing 2703 by 505, we get 5 with a remainder of 178.
The next digit of our result is 5. 
Result so far: 245.0
If we take 2525 away from 2703, we end up with 178.
Include the next digit (5) from the dividend after 178, then repeat: 1785 / 505

On to step 7:
505 goes into 1785 3 times with a remainder of 270.
Put 3 as the next digit of the answer. 
Result so far: 2453.0
The remainder is 270 after subtracting 1515 from 1785.
Bring next digit (3) of the dividend behind the 270 and repeat the process: 2703 / 505

Advancing to step 8:
505 can be fit into 2703 5 times, resulting in a remainder of 178.
Record the quotient 5 as the next digit in the result. 
Result so far: 24535.0
Deduct 2525 from 2703 and we're left with 178.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1780, and continue the process.

On to step 9:
The number 505 fits into 1780 3 times, leaving a remainder of 265.
Write down 3 as next digit of the result. 
Result so far: 24535.3
Deduct 1515 from 1780 and we're left with 265.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2650, and continue the process.

Step 10:
The number 505 fits into 2650 5 times, leaving a remainder of 125.
Write down 5 as next digit of the result. 
Result so far: 24535.35
Subtracting 2525 from 2650 leaves us with 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

On to step 11:
1250 divided by 505 is 2 with a remainder of 240.
The next digit of our result is 2. 
Result so far: 24535.352
If we subtract 1010 from 1250, we get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Step 12:
The number 505 fits into 2400 4 times, leaving a remainder of 380.
The number 4 becomes the next digit in our result. 
Result so far: 24535.3524
Subtracting 2020 from 2400 leaves us with 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

Moving on to step 13:
3800 divided by 505 is 7 with a remainder of 265.
Record the quotient 7 as the next digit in the result. 
Result so far: 24535.35247
Deduct 3535 from 3800 and we're left with 265.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2650, and continue the process.

Moving on to step 14:
When dividing 2650 by 505, we get 5 with a remainder of 125.
The next digit of our result is 5. 
Result so far: 24535.352475
If we take 2525 away from 2650, we end up with 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

Let's proceed to step 15:
When dividing 1250 by 505, we get 2 with a remainder of 240.
Put 2 as the next digit of the answer. 
Result so far: 24535.3524752
Deduct 1010 from 1250 and we're left with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Step 16:
505 goes into 2400 4 times with a remainder of 380.
The number 4 becomes the next digit in our result. 
Result so far: 24535.35247524
If we subtract 2020 from 2400, we get 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

The final outcome is 24535.35247524, with a leftover of 3.8e-07.