Let's divide 86835 by 21
Our goal is to divide 86835 by 21.

Moving on to step 1:
21 can be fit into 8 0 times, resulting in a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Append the next digit (6) from the dividend to 8 and continue with: 86 / 21

Going ahead to step 2:
86 divided by 21 is 4 with a remainder of 2.
The next digit of our result is 4. 
Result so far: 4.0
Subtracting 84 from 86 leaves us with 2.
Grab the next digit (8) from the dividend, add it to 2, then carry on: 28 / 21

Moving on to step 3:
The number 21 fits into 28 1 times, leaving a remainder of 7.
The next digit of our result is 1. 
Result so far: 41.0
If we subtract 21 from 28, we get 7.
Fetch the next digit (3) from the dividend, attach it to 7 and continue: 73 / 21

Step 4:
If we divide 73 by 21, we get 3 and a remainder of 10.
The next digit of our result is 3. 
Result so far: 413.0
Deduct 63 from 73 and we're left with 10.
Fetch the next digit (5) from the dividend, attach it to 10 and continue: 105 / 21

On to step 5:
21 goes into 105 5 times with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 4135.0
Subtract 105 from 105 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 6:
When dividing 0 by 21, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 4135.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 7:
21 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 4135.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 4135.0 and a remainder of 0.0.