86205085 divided by 399 
Our goal is to divide 86205085 by 399.

On to step 1:
The number 399 fits into 8 0 times, leaving a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 399

On to step 2:
If we divide 86 by 399, we get 0 and a remainder of 86.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 86, we end up with 86.
Append the next digit (2) from the dividend to 86 and continue with: 862 / 399

Advancing to step 3:
The number 399 fits into 862 2 times, leaving a remainder of 64.
Use 2 as the next digit of our solution. 
Result so far: 2.0
If we take 798 away from 862, we end up with 64.
Grab the next digit (0) from the dividend, add it to 64, then carry on: 640 / 399

Step 4:
399 can be fit into 640 1 times, resulting in a remainder of 241.
Put 1 as the next digit of the answer. 
Result so far: 21.0
Subtracting 399 from 640 leaves us with 241.
Include the next digit (5) from the dividend after 241, then repeat: 2415 / 399

Let's proceed to step 5:
The number 399 fits into 2415 6 times, leaving a remainder of 21.
Put 6 as the next digit of the answer. 
Result so far: 216.0
The remainder is 21 after subtracting 2394 from 2415.
Append the next digit (0) from the dividend to 21 and continue with: 210 / 399

Moving on to step 6:
If we divide 210 by 399, we get 0 and a remainder of 210.
Put 0 as the next digit of the answer. 
Result so far: 2160.0
Deduct 0 from 210 and we're left with 210.
Include the next digit (8) from the dividend after 210, then repeat: 2108 / 399

Let's proceed to step 7:
When dividing 2108 by 399, we get 5 with a remainder of 113.
The next digit of our result is 5. 
Result so far: 21605.0
Subtracting 1995 from 2108 leaves us with 113.
Bring next digit (5) of the dividend behind the 113 and repeat the process: 1135 / 399

Advancing to step 8:
1135 divided by 399 is 2 with a remainder of 337.
Record the quotient 2 as the next digit in the result. 
Result so far: 216052.0
If we take 798 away from 1135, we end up with 337.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3370, and continue the process.

Moving on to step 9:
399 goes into 3370 8 times with a remainder of 178.
Record the quotient 8 as the next digit in the result. 
Result so far: 216052.8
Deduct 3192 from 3370 and we're left with 178.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1780, and continue the process.

On to step 10:
1780 divided by 399 is 4 with a remainder of 184.
Record the quotient 4 as the next digit in the result. 
Result so far: 216052.84
The remainder is 184 after subtracting 1596 from 1780.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

On to step 11:
If we divide 1840 by 399, we get 4 and a remainder of 244.
Use 4 as the next digit of our solution. 
Result so far: 216052.844
If we take 1596 away from 1840, we end up with 244.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

After the division, we end up with 216052.844 and a remainder of 0.0244.