We look at the division of 12939806 by 415 
We want to divide 12939806 by 415.

On to step 1:
415 goes into 1 0 times with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 415

Advancing to step 2:
If we divide 12 by 415, we get 0 and a remainder of 12.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 12, we end up with 12.
Take the next digit (9) from the dividend and append it to 12, then repeat: 129 / 415

Step 3:
415 can be fit into 129 0 times, resulting in a remainder of 129.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 129, we end up with 129.
Append the next digit (3) from the dividend to 129 and continue with: 1293 / 415

Going ahead to step 4:
If we divide 1293 by 415, we get 3 and a remainder of 48.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we take 1245 away from 1293, we end up with 48.
Grab the next digit (9) from the dividend, add it to 48, then carry on: 489 / 415

Moving on to step 5:
The number 415 fits into 489 1 times, leaving a remainder of 74.
Write down 1 as next digit of the result. 
Result so far: 31.0
If we take 415 away from 489, we end up with 74.
Grab the next digit (8) from the dividend, add it to 74, then carry on: 748 / 415

Advancing to step 6:
When dividing 748 by 415, we get 1 with a remainder of 333.
Record the quotient 1 as the next digit in the result. 
Result so far: 311.0
Subtracting 415 from 748 leaves us with 333.
Append the next digit (0) from the dividend to 333 and continue with: 3330 / 415

Let's proceed to step 7:
If we divide 3330 by 415, we get 8 and a remainder of 10.
Use 8 as the next digit of our solution. 
Result so far: 3118.0
If we take 3320 away from 3330, we end up with 10.
Fetch the next digit (6) from the dividend, attach it to 10 and continue: 106 / 415

Let's proceed to step 8:
When dividing 106 by 415, we get 0 with a remainder of 106.
Put 0 as the next digit of the answer. 
Result so far: 31180.0
Subtracting 0 from 106 leaves us with 106.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1060, and continue the process.

Let's proceed to step 9:
The number 415 fits into 1060 2 times, leaving a remainder of 230.
The number 2 becomes the next digit in our result. 
Result so far: 31180.2
Subtracting 830 from 1060 leaves us with 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2300, and continue the process.

Advancing to step 10:
If we divide 2300 by 415, we get 5 and a remainder of 225.
Record the quotient 5 as the next digit in the result. 
Result so far: 31180.25
Deduct 2075 from 2300 and we're left with 225.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2250, and continue the process.

On to step 11:
2250 divided by 415 is 5 with a remainder of 175.
The number 5 becomes the next digit in our result. 
Result so far: 31180.255
If we take 2075 away from 2250, we end up 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.

Our division results in 31180.255 with a remaining 0.0175.