Let's divide 129902 by 86
Let's see how many times 86 fits into 129902.

Step 1:
1 divided by 86 is 0 with a remainder of 1.
The next digit of our result is 0. 
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 / 86

Moving on to step 2:
The number 86 fits into 12 0 times, leaving a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 12, we get 12.
Fetch the next digit (9) from the dividend, attach it to 12 and continue: 129 / 86

Let's proceed to step 3:
129 divided by 86 is 1 with a remainder of 43.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 86 from 129 to get 43.
Fetch the next digit (9) from the dividend, attach it to 43 and continue: 439 / 86

Advancing to step 4:
86 goes into 439 5 times with a remainder of 9.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
Subtracting 430 from 439 leaves us with 9.
Include the next digit (0) from the dividend after 9, then repeat: 90 / 86

Moving on to step 5:
86 can be fit into 90 1 times, resulting in a remainder of 4.
Write down 1 as next digit of the result. 
Result so far: 151.0
Subtract 86 from 90 to get 4.
Include the next digit (2) from the dividend after 4, then repeat: 42 / 86

Let's proceed to step 6:
When dividing 42 by 86, we get 0 with a remainder of 42.
Record the quotient 0 as the next digit in the result. 
Result so far: 1510.0
Subtract 0 from 42 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

On to step 7:
86 can be fit into 420 4 times, resulting in a remainder of 76.
Use 4 as the next digit of our solution. 
Result so far: 1510.4
If we subtract 344 from 420, we get 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Step 8:
86 can be fit into 760 8 times, resulting in a remainder of 72.
Write down 8 as next digit of the result. 
Result so far: 1510.48
Subtracting 688 from 760 leaves us with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Moving on to step 9:
720 divided by 86 is 8 with a remainder of 32.
Write down 8 as next digit of the result. 
Result so far: 1510.488
Deduct 688 from 720 and we're left with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

After the division, we end up with 1510.488 and a remainder of 0.0032.