We divide 129660 by 31
We're looking to find how many times 31 goes into 129660.

Moving on to step 1:
31 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.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 31

Let's proceed to step 2:
12 divided by 31 is 0 with a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 12, we get 12.
Append the next digit (9) from the dividend to 12 and continue with: 129 / 31

On to step 3:
When dividing 129 by 31, we get 4 with a remainder of 5.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we take 124 away from 129, we end up with 5.
Grab the next digit (6) from the dividend, add it to 5, then carry on: 56 / 31

On to step 4:
56 divided by 31 is 1 with a remainder of 25.
Put 1 as the next digit of the answer. 
Result so far: 41.0
If we subtract 31 from 56, we get 25.
Append the next digit (6) from the dividend to 25 and continue with: 256 / 31

Moving on to step 5:
The number 31 fits into 256 8 times, leaving a remainder of 8.
Record the quotient 8 as the next digit in the result. 
Result so far: 418.0
Deduct 248 from 256 and we're left with 8.
Append the next digit (0) from the dividend to 8 and continue with: 80 / 31

On to step 6:
When dividing 80 by 31, we get 2 with a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 4182.0
If we subtract 62 from 80, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 7:
31 goes into 180 5 times with a remainder of 25.
The next digit of our result is 5. 
Result so far: 4182.5
Deduct 155 from 180 and we're left with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Step 8:
250 divided by 31 is 8 with a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 4182.58
The remainder is 2 after subtracting 248 from 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 9:
The number 31 fits into 20 0 times, leaving a remainder of 20.
The next digit of our result is 0. 
Result so far: 4182.58
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 10:
31 can be fit into 200 6 times, resulting in a remainder of 14.
Write down 6 as next digit of the result. 
Result so far: 4182.5806
The remainder is 14 after subtracting 186 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 11:
If we divide 140 by 31, we get 4 and a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 4182.58064
Deduct 124 from 140 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Advancing to step 12:
If we divide 160 by 31, we get 5 and a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 4182.580645
Subtract 155 from 160 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 13:
31 goes into 50 1 times with a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 4182.5806451
If we subtract 31 from 50, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 14:
If we divide 190 by 31, we get 6 and a remainder of 4.
The next digit of our result is 6. 
Result so far: 4182.58064516
The remainder is 4 after subtracting 186 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The final outcome is 4182.58064516, with a leftover of 4e-09.