12976399 ÷ 345 
Let's see how many times 345 fits into 12976399.

Moving on to step 1:
345 goes into 1 0 times with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 345

Moving on to step 2:
345 goes into 12 0 times with a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 12 after subtracting 0 from 12.
Include the next digit (9) from the dividend after 12, then repeat: 129 / 345

On to step 3:
If we divide 129 by 345, we get 0 and a remainder of 129.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 129 to get 129.
Take the next digit (7) from the dividend and append it to 129, then repeat: 1297 / 345

Going ahead to step 4:
345 goes into 1297 3 times with a remainder of 262.
The next digit of our result is 3. 
Result so far: 3.0
Subtracting 1035 from 1297 leaves us with 262.
Bring next digit (6) of the dividend behind the 262 and repeat the process: 2626 / 345

On to step 5:
345 can be fit into 2626 7 times, resulting in a remainder of 211.
The number 7 becomes the next digit in our result. 
Result so far: 37.0
Deduct 2415 from 2626 and we're left with 211.
Fetch the next digit (3) from the dividend, attach it to 211 and continue: 2113 / 345

Let's proceed to step 6:
When dividing 2113 by 345, we get 6 with a remainder of 43.
The next digit of our result is 6. 
Result so far: 376.0
Deduct 2070 from 2113 and we're left with 43.
Fetch the next digit (9) from the dividend, attach it to 43 and continue: 439 / 345

On to step 7:
The number 345 fits into 439 1 times, leaving a remainder of 94.
Use 1 as the next digit of our solution. 
Result so far: 3761.0
Deduct 345 from 439 and we're left with 94.
Fetch the next digit (9) from the dividend, attach it to 94 and continue: 949 / 345

Step 8:
949 divided by 345 is 2 with a remainder of 259.
The number 2 becomes the next digit in our result. 
Result so far: 37612.0
If we subtract 690 from 949, we get 259.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2590, and continue the process.

Moving on to step 9:
2590 divided by 345 is 7 with a remainder of 175.
Put 7 as the next digit of the answer. 
Result so far: 37612.7
Subtracting 2415 from 2590 leaves us with 175.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1750, and continue the process.

On to step 10:
345 goes into 1750 5 times with a remainder of 25.
Record the quotient 5 as the next digit in the result. 
Result so far: 37612.75
Subtract 1725 from 1750 to get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Let's proceed to step 11:
345 can be fit into 250 0 times, resulting in a remainder of 250.
Use 0 as the next digit of our solution. 
Result so far: 37612.75
The remainder is 250 after subtracting 0 from 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

Advancing to step 12:
2500 divided by 345 is 7 with a remainder of 85.
Record the quotient 7 as the next digit in the result. 
Result so far: 37612.7507
The remainder is 85 after subtracting 2415 from 2500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Step 13:
345 can be fit into 850 2 times, resulting in a remainder of 160.
Record the quotient 2 as the next digit in the result. 
Result so far: 37612.75072
Subtracting 690 from 850 leaves us with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Going ahead to step 14:
345 can be fit into 1600 4 times, resulting in a remainder of 220.
Put 4 as the next digit of the answer. 
Result so far: 37612.750724
Subtract 1380 from 1600 to get 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Step 15:
2200 divided by 345 is 6 with a remainder of 130.
The next digit of our result is 6. 
Result so far: 37612.7507246
If we subtract 2070 from 2200, we get 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Going ahead to step 16:
If we divide 1300 by 345, we get 3 and a remainder of 265.
Write down 3 as next digit of the result. 
Result so far: 37612.75072463
If we subtract 1035 from 1300, we get 265.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2650, and continue the process.

After the division, we end up with 37612.75072463 and a remainder of 2.65e-07.