We're dividing 15439 by 86 
We want to figure out the number of times 15439 can be divided by 86.

Advancing to step 1:
The number 86 fits into 1 0 times, leaving a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 86

Going ahead to step 2:
15 divided by 86 is 0 with a remainder of 15.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 15, we get 15.
Fetch the next digit (4) from the dividend, attach it to 15 and continue: 154 / 86

Advancing to step 3:
If we divide 154 by 86, we get 1 and a remainder of 68.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 86 from 154, we get 68.
Take the next digit (3) from the dividend and append it to 68, then repeat: 683 / 86

Advancing to step 4:
When dividing 683 by 86, we get 7 with a remainder of 81.
Record the quotient 7 as the next digit in the result. 
Result so far: 17.0
Subtract 602 from 683 to get 81.
Grab the next digit (9) from the dividend, add it to 81, then carry on: 819 / 86

On to step 5:
86 goes into 819 9 times with a remainder of 45.
The number 9 becomes the next digit in our result. 
Result so far: 179.0
If we take 774 away from 819, we end up with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Let's proceed to step 6:
86 goes into 450 5 times with a remainder of 20.
Write down 5 as next digit of the result. 
Result so far: 179.5
Subtracting 430 from 450 leaves us 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.

Advancing to step 7:
86 goes into 200 2 times with a remainder of 28.
Record the quotient 2 as the next digit in the result. 
Result so far: 179.52
Deduct 172 from 200 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Advancing to step 8:
86 can be fit into 280 3 times, resulting in a remainder of 22.
Use 3 as the next digit of our solution. 
Result so far: 179.523
Deduct 258 from 280 and we're left with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Let's proceed to step 9:
When dividing 220 by 86, we get 2 with a remainder of 48.
Use 2 as the next digit of our solution. 
Result so far: 179.5232
Subtracting 172 from 220 leaves us with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Let's proceed to step 10:
86 goes into 480 5 times with a remainder of 50.
The number 5 becomes the next digit in our result. 
Result so far: 179.52325
If we subtract 430 from 480, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 11:
86 can be fit into 500 5 times, resulting in a remainder of 70.
Write down 5 as next digit of the result. 
Result so far: 179.523255
Subtracting 430 from 500 leaves us with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

The quotient of the division is 179.523255, and the remainder is 7e-06.