We're dividing 13587425 by 871 
Let's see how many times 871 fits into 13587425.

On to step 1:
If we divide 1 by 871, we get 0 and a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Fetch the next digit (3) from the dividend, attach it to 1 and continue: 13 / 871

Let's proceed to step 2:
871 goes into 13 0 times with a remainder of 13.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 13, we get 13.
Grab the next digit (5) from the dividend, add it to 13, then carry on: 135 / 871

Going ahead to step 3:
When dividing 135 by 871, we get 0 with a remainder of 135.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 135 and we're left with 135.
Include the next digit (8) from the dividend after 135, then repeat: 1358 / 871

Step 4:
1358 divided by 871 is 1 with a remainder of 487.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 871 from 1358 and we're left with 487.
Take the next digit (7) from the dividend and append it to 487, then repeat: 4877 / 871

Going ahead to step 5:
When dividing 4877 by 871, we get 5 with a remainder of 522.
Write down 5 as next digit of the result. 
Result so far: 15.0
The remainder is 522 after subtracting 4355 from 4877.
Take the next digit (4) from the dividend and append it to 522, then repeat: 5224 / 871

On to step 6:
871 goes into 5224 5 times with a remainder of 869.
Put 5 as the next digit of the answer. 
Result so far: 155.0
The remainder is 869 after subtracting 4355 from 5224.
Append the next digit (2) from the dividend to 869 and continue with: 8692 / 871

Advancing to step 7:
When dividing 8692 by 871, we get 9 with a remainder of 853.
The number 9 becomes the next digit in our result. 
Result so far: 1559.0
Subtracting 7839 from 8692 leaves us with 853.
Grab the next digit (5) from the dividend, add it to 853, then carry on: 8535 / 871

On to step 8:
The number 871 fits into 8535 9 times, leaving a remainder of 696.
Write down 9 as next digit of the result. 
Result so far: 15599.0
Subtracting 7839 from 8535 leaves us with 696.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6960, and continue the process.

Step 9:
871 can be fit into 6960 7 times, resulting in a remainder of 863.
Write down 7 as next digit of the result. 
Result so far: 15599.7
Deduct 6097 from 6960 and we're left with 863.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8630, and continue the process.

On to step 10:
8630 divided by 871 is 9 with a remainder of 791.
Write down 9 as next digit of the result. 
Result so far: 15599.79
Subtract 7839 from 8630 to get 791.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7910, and continue the process.

On to step 11:
If we divide 7910 by 871, we get 9 and a remainder of 71.
Put 9 as the next digit of the answer. 
Result so far: 15599.799
Subtracting 7839 from 7910 leaves us with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

The final outcome is 15599.799, with a leftover of 0.0071.