We're dividing 12379349 by 509 
We want to divide 12379349 by 509.

On to step 1:
509 goes into 1 0 times with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 509

Moving on to step 2:
509 can be fit into 12 0 times, resulting in a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 12, we get 12.
Grab the next digit (3) from the dividend, add it to 12, then carry on: 123 / 509

Advancing to step 3:
When dividing 123 by 509, we get 0 with a remainder of 123.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 123 to get 123.
Take the next digit (7) from the dividend and append it to 123, then repeat: 1237 / 509

Going ahead to step 4:
509 can be fit into 1237 2 times, resulting in a remainder of 219.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtract 1018 from 1237 to get 219.
Append the next digit (9) from the dividend to 219 and continue with: 2199 / 509

Advancing to step 5:
If we divide 2199 by 509, we get 4 and a remainder of 163.
Use 4 as the next digit of our solution. 
Result so far: 24.0
The remainder is 163 after subtracting 2036 from 2199.
Append the next digit (3) from the dividend to 163 and continue with: 1633 / 509

Moving on to step 6:
509 can be fit into 1633 3 times, resulting in a remainder of 106.
The number 3 becomes the next digit in our result. 
Result so far: 243.0
Deduct 1527 from 1633 and we're left with 106.
Include the next digit (4) from the dividend after 106, then repeat: 1064 / 509

Step 7:
509 goes into 1064 2 times with a remainder of 46.
Use 2 as the next digit of our solution. 
Result so far: 2432.0
The remainder is 46 after subtracting 1018 from 1064.
Fetch the next digit (9) from the dividend, attach it to 46 and continue: 469 / 509

Let's proceed to step 8:
The number 509 fits into 469 0 times, leaving a remainder of 469.
The number 0 becomes the next digit in our result. 
Result so far: 24320.0
Subtract 0 from 469 to get 469.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4690, and continue the process.

Let's proceed to step 9:
509 goes into 4690 9 times with a remainder of 109.
Write down 9 as next digit of the result. 
Result so far: 24320.9
Deduct 4581 from 4690 and we're left with 109.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1090, and continue the process.

Moving on to step 10:
509 can be fit into 1090 2 times, resulting in a remainder of 72.
The next digit of our result is 2. 
Result so far: 24320.92
The remainder is 72 after subtracting 1018 from 1090.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Step 11:
509 goes into 720 1 times with a remainder of 211.
Put 1 as the next digit of the answer. 
Result so far: 24320.921
Subtracting 509 from 720 leaves us with 211.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2110, and continue the process.

Step 12:
The number 509 fits into 2110 4 times, leaving a remainder of 74.
The number 4 becomes the next digit in our result. 
Result so far: 24320.9214
The remainder is 74 after subtracting 2036 from 2110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

On to step 13:
740 divided by 509 is 1 with a remainder of 231.
Use 1 as the next digit of our solution. 
Result so far: 24320.92141
If we take 509 away from 740, we end up with 231.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2310, and continue the process.

Moving on to step 14:
The number 509 fits into 2310 4 times, leaving a remainder of 274.
The next digit of our result is 4. 
Result so far: 24320.921414
Subtract 2036 from 2310 to get 274.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2740, and continue the process.

Going ahead to step 15:
When dividing 2740 by 509, we get 5 with a remainder of 195.
Write down 5 as next digit of the result. 
Result so far: 24320.9214145
Subtracting 2545 from 2740 leaves us with 195.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1950, and continue the process.

Advancing to step 16:
The number 509 fits into 1950 3 times, leaving a remainder of 423.
The number 3 becomes the next digit in our result. 
Result so far: 24320.92141453
Subtract 1527 from 1950 to get 423.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4230, and continue the process.

The final result is 24320.92141453 with a remainder of 4.23e-07.