We divide 210300 by 86
Let's see how many times 86 fits into 210300.

On to step 1:
If we divide 2 by 86, we get 0 and a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 86

On to step 2:
86 can be fit into 21 0 times, resulting in a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Bring next digit (0) of the dividend behind the 21 and repeat the process: 210 / 86

Moving on to step 3:
The number 86 fits into 210 2 times, leaving a remainder of 38.
Use 2 as the next digit of our solution. 
Result so far: 2.0
If we subtract 172 from 210, we get 38.
Include the next digit (3) from the dividend after 38, then repeat: 383 / 86

Advancing to step 4:
86 goes into 383 4 times with a remainder of 39.
The next digit of our result is 4. 
Result so far: 24.0
Deduct 344 from 383 and we're left with 39.
Append the next digit (0) from the dividend to 39 and continue with: 390 / 86

On to step 5:
If we divide 390 by 86, we get 4 and a remainder of 46.
Put 4 as the next digit of the answer. 
Result so far: 244.0
If we subtract 344 from 390, we get 46.
Fetch the next digit (0) from the dividend, attach it to 46 and continue: 460 / 86

On to step 6:
86 can be fit into 460 5 times, resulting in a remainder of 30.
The next digit of our result is 5. 
Result so far: 2445.0
Deduct 430 from 460 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 7:
86 goes into 300 3 times with a remainder of 42.
Use 3 as the next digit of our solution. 
Result so far: 2445.3
The remainder is 42 after subtracting 258 from 300.
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 8:
If we divide 420 by 86, we get 4 and a remainder of 76.
Use 4 as the next digit of our solution. 
Result so far: 2445.34
If we take 344 away from 420, we end up with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Going ahead to step 9:
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: 2445.348
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.

Moving on to step 10:
720 divided by 86 is 8 with a remainder of 32.
Put 8 as the next digit of the answer. 
Result so far: 2445.3488
If we subtract 688 from 720, we get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

The final result is 2445.3488 with a remainder of 0.00032.