25139 divided by 86 
We want to divide 25139 by 86.

Step 1:
2 divided by 86 is 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Include the next digit (5) from the dividend after 2, then repeat: 25 / 86

Going ahead to step 2:
86 goes into 25 0 times with a remainder of 25.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 25 leaves us with 25.
Grab the next digit (1) from the dividend, add it to 25, then carry on: 251 / 86

Advancing to step 3:
251 divided by 86 is 2 with a remainder of 79.
The next digit of our result is 2. 
Result so far: 2.0
Deduct 172 from 251 and we're left with 79.
Append the next digit (3) from the dividend to 79 and continue with: 793 / 86

Step 4:
The number 86 fits into 793 9 times, leaving a remainder of 19.
The next digit of our result is 9. 
Result so far: 29.0
If we subtract 774 from 793, we get 19.
Grab the next digit (9) from the dividend, add it to 19, then carry on: 199 / 86

Advancing to step 5:
When dividing 199 by 86, we get 2 with a remainder of 27.
Use 2 as the next digit of our solution. 
Result so far: 292.0
If we subtract 172 from 199, we get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

On to step 6:
86 goes into 270 3 times with a remainder of 12.
The next digit of our result is 3. 
Result so far: 292.3
If we subtract 258 from 270, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 7:
86 goes into 120 1 times with a remainder of 34.
The number 1 becomes the next digit in our result. 
Result so far: 292.31
Subtract 86 from 120 to get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

On to step 8:
If we divide 340 by 86, we get 3 and a remainder of 82.
The next digit of our result is 3. 
Result so far: 292.313
Deduct 258 from 340 and we're left with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Advancing to step 9:
When dividing 820 by 86, we get 9 with a remainder of 46.
Record the quotient 9 as the next digit in the result. 
Result so far: 292.3139
Subtracting 774 from 820 leaves us with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Step 10:
The number 86 fits into 460 5 times, leaving a remainder of 30.
Write down 5 as next digit of the result. 
Result so far: 292.31395
The remainder is 30 after subtracting 430 from 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 11:
86 can be fit into 300 3 times, resulting in a remainder of 42.
Use 3 as the next digit of our solution. 
Result so far: 292.313953
Subtracting 258 from 300 leaves us with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 12:
When dividing 420 by 86, we get 4 with a remainder of 76.
Record the quotient 4 as the next digit in the result. 
Result so far: 292.3139534
The remainder is 76 after subtracting 344 from 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

On to step 13:
If we divide 760 by 86, we get 8 and a remainder of 72.
Write down 8 as next digit of the result. 
Result so far: 292.31395348
Subtract 688 from 760 to get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

The final outcome is 292.31395348, with a leftover of 7.2e-08.