Let's divide 863516 by 21
We want to divide 863516 by 21.

Let's proceed to step 1:
When dividing 8 by 21, we get 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Append the next digit (6) from the dividend to 8 and continue with: 86 / 21

Moving on to step 2:
If we divide 86 by 21, we get 4 and a remainder of 2.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we take 84 away from 86, we end up with 2.
Fetch the next digit (3) from the dividend, attach it to 2 and continue: 23 / 21

Advancing to step 3:
21 goes into 23 1 times with a remainder of 2.
The number 1 becomes the next digit in our result. 
Result so far: 41.0
Deduct 21 from 23 and we're left with 2.
Fetch the next digit (5) from the dividend, attach it to 2 and continue: 25 / 21

Advancing to step 4:
If we divide 25 by 21, we get 1 and a remainder of 4.
The next digit of our result is 1. 
Result so far: 411.0
The remainder is 4 after subtracting 21 from 25.
Bring next digit (1) of the dividend behind the 4 and repeat the process: 41 / 21

Moving on to step 5:
21 goes into 41 1 times with a remainder of 20.
Put 1 as the next digit of the answer. 
Result so far: 4111.0
If we take 21 away from 41, we end up with 20.
Append the next digit (6) from the dividend to 20 and continue with: 206 / 21

Step 6:
206 divided by 21 is 9 with a remainder of 17.
Write down 9 as next digit of the result. 
Result so far: 41119.0
Subtract 189 from 206 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Advancing to step 7:
170 divided by 21 is 8 with a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 41119.8
Deduct 168 from 170 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 8:
21 can be fit into 20 0 times, resulting in a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 41119.8
The remainder is 20 after subtracting 0 from 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 9:
21 can be fit into 200 9 times, resulting in a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 41119.809
If we take 189 away from 200, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 10:
21 can be fit into 110 5 times, resulting in a remainder of 5.
The next digit of our result is 5. 
Result so far: 41119.8095
Subtracting 105 from 110 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 11:
21 can be fit into 50 2 times, resulting in a remainder of 8.
The next digit of our result is 2. 
Result so far: 41119.80952
If we take 42 away from 50, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 12:
80 divided by 21 is 3 with a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 41119.809523
Deduct 63 from 80 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

On to step 13:
21 can be fit into 170 8 times, resulting in a remainder of 2.
The next digit of our result is 8. 
Result so far: 41119.8095238
If we take 168 away from 170, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 14:
When dividing 20 by 21, we get 0 with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 41119.8095238
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The final outcome is 41119.8095238, with a leftover of 2e-08.