315581 ÷ 86 
We want to divide 315581 by 86.

Advancing to step 1:
86 can be fit into 3 0 times, resulting in a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Take the next digit (1) from the dividend and append it to 3, then repeat: 31 / 86

Let's proceed to step 2:
31 divided by 86 is 0 with a remainder of 31.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 31 leaves us with 31.
Bring next digit (5) of the dividend behind the 31 and repeat the process: 315 / 86

Going ahead to step 3:
If we divide 315 by 86, we get 3 and a remainder of 57.
The next digit of our result is 3. 
Result so far: 3.0
If we subtract 258 from 315, we get 57.
Include the next digit (5) from the dividend after 57, then repeat: 575 / 86

On to step 4:
When dividing 575 by 86, we get 6 with a remainder of 59.
Record the quotient 6 as the next digit in the result. 
Result so far: 36.0
Deduct 516 from 575 and we're left with 59.
Bring next digit (8) of the dividend behind the 59 and repeat the process: 598 / 86

Moving on to step 5:
598 divided by 86 is 6 with a remainder of 82.
The next digit of our result is 6. 
Result so far: 366.0
Subtract 516 from 598 to get 82.
Include the next digit (1) from the dividend after 82, then repeat: 821 / 86

Advancing to step 6:
821 divided by 86 is 9 with a remainder of 47.
The next digit of our result is 9. 
Result so far: 3669.0
The remainder is 47 after subtracting 774 from 821.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Going ahead to step 7:
The number 86 fits into 470 5 times, leaving a remainder of 40.
Put 5 as the next digit of the answer. 
Result so far: 3669.5
Subtract 430 from 470 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 8:
If we divide 400 by 86, we get 4 and a remainder of 56.
The number 4 becomes the next digit in our result. 
Result so far: 3669.54
If we subtract 344 from 400, we get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

On to step 9:
560 divided by 86 is 6 with a remainder of 44.
Write down 6 as next digit of the result. 
Result so far: 3669.546
The remainder is 44 after subtracting 516 from 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Step 10:
86 can be fit into 440 5 times, resulting in a remainder of 10.
Write down 5 as next digit of the result. 
Result so far: 3669.5465
If we subtract 430 from 440, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 11:
The number 86 fits into 100 1 times, leaving a remainder of 14.
The next digit of our result is 1. 
Result so far: 3669.54651
Subtracting 86 from 100 leaves us with 14.
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 12:
86 goes into 140 1 times with a remainder of 54.
Put 1 as the next digit of the answer. 
Result so far: 3669.546511
Subtract 86 from 140 to get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Our division results in 3669.546511 with a remaining 5.4e-06.