23931408 ÷ 309 
Our goal is to divide 23931408 by 309.

Let's proceed to step 1:
The number 309 fits into 2 0 times, leaving a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Bring next digit (3) of the dividend behind the 2 and repeat the process: 23 / 309

Step 2:
When dividing 23 by 309, we get 0 with a remainder of 23.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 23 to get 23.
Grab the next digit (9) from the dividend, add it to 23, then carry on: 239 / 309

Advancing to step 3:
When dividing 239 by 309, we get 0 with a remainder of 239.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 239 and we're left with 239.
Include the next digit (3) from the dividend after 239, then repeat: 2393 / 309

Advancing to step 4:
The number 309 fits into 2393 7 times, leaving a remainder of 230.
Use 7 as the next digit of our solution. 
Result so far: 7.0
The remainder is 230 after subtracting 2163 from 2393.
Take the next digit (1) from the dividend and append it to 230, then repeat: 2301 / 309

Let's proceed to step 5:
309 goes into 2301 7 times with a remainder of 138.
Record the quotient 7 as the next digit in the result. 
Result so far: 77.0
Deduct 2163 from 2301 and we're left with 138.
Grab the next digit (4) from the dividend, add it to 138, then carry on: 1384 / 309

On to step 6:
1384 divided by 309 is 4 with a remainder of 148.
Write down 4 as next digit of the result. 
Result so far: 774.0
If we subtract 1236 from 1384, we get 148.
Grab the next digit (0) from the dividend, add it to 148, then carry on: 1480 / 309

Step 7:
If we divide 1480 by 309, we get 4 and a remainder of 244.
The next digit of our result is 4. 
Result so far: 7744.0
Subtract 1236 from 1480 to get 244.
Fetch the next digit (8) from the dividend, attach it to 244 and continue: 2448 / 309

Going ahead to step 8:
309 can be fit into 2448 7 times, resulting in a remainder of 285.
Use 7 as the next digit of our solution. 
Result so far: 77447.0
If we subtract 2163 from 2448, we get 285.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2850, and continue the process.

On to step 9:
309 goes into 2850 9 times with a remainder of 69.
Record the quotient 9 as the next digit in the result. 
Result so far: 77447.9
The remainder is 69 after subtracting 2781 from 2850.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

On to step 10:
When dividing 690 by 309, we get 2 with a remainder of 72.
Put 2 as the next digit of the answer. 
Result so far: 77447.92
Subtract 618 from 690 to get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Let's proceed to step 11:
The number 309 fits into 720 2 times, leaving a remainder of 102.
The number 2 becomes the next digit in our result. 
Result so far: 77447.922
If we subtract 618 from 720, we get 102.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1020, and continue the process.

The final result is 77447.922 with a remainder of 0.0102.