12912303 ÷ 939 
We want to figure out the number of times 12912303 can be divided by 939.

Advancing to step 1:
1 divided by 939 is 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 939

Let's proceed to step 2:
12 divided by 939 is 0 with a remainder of 12.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 12 leaves us with 12.
Fetch the next digit (9) from the dividend, attach it to 12 and continue: 129 / 939

Moving on to step 3:
The number 939 fits into 129 0 times, leaving a remainder of 129.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 129 after subtracting 0 from 129.
Bring next digit (1) of the dividend behind the 129 and repeat the process: 1291 / 939

Moving on to step 4:
939 can be fit into 1291 1 times, resulting in a remainder of 352.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 939 from 1291 to get 352.
Fetch the next digit (2) from the dividend, attach it to 352 and continue: 3522 / 939

Moving on to step 5:
If we divide 3522 by 939, we get 3 and a remainder of 705.
Put 3 as the next digit of the answer. 
Result so far: 13.0
If we subtract 2817 from 3522, we get 705.
Bring next digit (3) of the dividend behind the 705 and repeat the process: 7053 / 939

Step 6:
The number 939 fits into 7053 7 times, leaving a remainder of 480.
The next digit of our result is 7. 
Result so far: 137.0
If we take 6573 away from 7053, we end up with 480.
Bring next digit (0) of the dividend behind the 480 and repeat the process: 4800 / 939

Moving on to step 7:
When dividing 4800 by 939, we get 5 with a remainder of 105.
The next digit of our result is 5. 
Result so far: 1375.0
The remainder is 105 after subtracting 4695 from 4800.
Fetch the next digit (3) from the dividend, attach it to 105 and continue: 1053 / 939

Going ahead to step 8:
1053 divided by 939 is 1 with a remainder of 114.
The next digit of our result is 1. 
Result so far: 13751.0
If we take 939 away from 1053, we end up with 114.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1140, and continue the process.

Let's proceed to step 9:
1140 divided by 939 is 1 with a remainder of 201.
Write down 1 as next digit of the result. 
Result so far: 13751.1
Subtracting 939 from 1140 leaves us with 201.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2010, and continue the process.

Let's proceed to step 10:
2010 divided by 939 is 2 with a remainder of 132.
Write down 2 as next digit of the result. 
Result so far: 13751.12
Deduct 1878 from 2010 and we're left with 132.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1320, and continue the process.

Step 11:
939 goes into 1320 1 times with a remainder of 381.
Write down 1 as next digit of the result. 
Result so far: 13751.121
The remainder is 381 after subtracting 939 from 1320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3810, and continue the process.

Moving on to step 12:
If we divide 3810 by 939, we get 4 and a remainder of 54.
Put 4 as the next digit of the answer. 
Result so far: 13751.1214
The remainder is 54 after subtracting 3756 from 3810.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

On to step 13:
When dividing 540 by 939, we get 0 with a remainder of 540.
Put 0 as the next digit of the answer. 
Result so far: 13751.1214
If we take 0 away from 540, we end up with 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5400, and continue the process.

Let's proceed to step 14:
939 goes into 5400 5 times with a remainder of 705.
Put 5 as the next digit of the answer. 
Result so far: 13751.121405
If we take 4695 away from 5400, we end up with 705.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7050, and continue the process.

Going ahead to step 15:
When dividing 7050 by 939, we get 7 with a remainder of 477.
Put 7 as the next digit of the answer. 
Result so far: 13751.1214057
Subtracting 6573 from 7050 leaves us with 477.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4770, and continue the process.

Going ahead to step 16:
If we divide 4770 by 939, we get 5 and a remainder of 75.
Record the quotient 5 as the next digit in the result. 
Result so far: 13751.12140575
Subtract 4695 from 4770 to get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

In conclusion, the division gives 13751.12140575 with a balance of 7.5e-08.