129415 divided by 31 
We want to divide 129415 by 31.

Let's proceed to step 1:
If we divide 1 by 31, we get 0 and a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 31

Moving on to step 2:
The number 31 fits into 12 0 times, leaving a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 12 and we're left with 12.
Append the next digit (9) from the dividend to 12 and continue with: 129 / 31

On to step 3:
The number 31 fits into 129 4 times, leaving a remainder of 5.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we subtract 124 from 129, we get 5.
Append the next digit (4) from the dividend to 5 and continue with: 54 / 31

Going ahead to step 4:
31 can be fit into 54 1 times, resulting in a remainder of 23.
Write down 1 as next digit of the result. 
Result so far: 41.0
Subtract 31 from 54 to get 23.
Grab the next digit (1) from the dividend, add it to 23, then carry on: 231 / 31

Going ahead to step 5:
31 goes into 231 7 times with a remainder of 14.
Record the quotient 7 as the next digit in the result. 
Result so far: 417.0
Deduct 217 from 231 and we're left with 14.
Bring next digit (5) of the dividend behind the 14 and repeat the process: 145 / 31

Let's proceed to step 6:
31 goes into 145 4 times with a remainder of 21.
Use 4 as the next digit of our solution. 
Result so far: 4174.0
If we subtract 124 from 145, we get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

On to step 7:
31 can be fit into 210 6 times, resulting in a remainder of 24.
Put 6 as the next digit of the answer. 
Result so far: 4174.6
Subtracting 186 from 210 leaves us with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 8:
31 can be fit into 240 7 times, resulting in a remainder of 23.
The next digit of our result is 7. 
Result so far: 4174.67
Subtract 217 from 240 to get 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Going ahead to step 9:
When dividing 230 by 31, we get 7 with a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 4174.677
Subtract 217 from 230 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

The final result is 4174.677 with a remainder of 0.0013.