Let's divide 192399 by 21
We want to divide 192399 by 21.

Advancing to step 1:
21 can be fit into 1 0 times, resulting in a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Fetch the next digit (9) from the dividend, attach it to 1 and continue: 19 / 21

Advancing to step 2:
19 divided by 21 is 0 with a remainder of 19.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 19 and we're left with 19.
Fetch the next digit (2) from the dividend, attach it to 19 and continue: 192 / 21

Going ahead to step 3:
21 can be fit into 192 9 times, resulting in a remainder of 3.
Put 9 as the next digit of the answer. 
Result so far: 9.0
If we take 189 away from 192, we end up with 3.
Append the next digit (3) from the dividend to 3 and continue with: 33 / 21

Advancing to step 4:
21 goes into 33 1 times with a remainder of 12.
Use 1 as the next digit of our solution. 
Result so far: 91.0
Subtracting 21 from 33 leaves us with 12.
Bring next digit (9) of the dividend behind the 12 and repeat the process: 129 / 21

Step 5:
If we divide 129 by 21, we get 6 and a remainder of 3.
The next digit of our result is 6. 
Result so far: 916.0
If we take 126 away from 129, we end up with 3.
Take the next digit (9) from the dividend and append it to 3, then repeat: 39 / 21

Advancing to step 6:
When dividing 39 by 21, we get 1 with a remainder of 18.
Use 1 as the next digit of our solution. 
Result so far: 9161.0
If we subtract 21 from 39, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 7:
21 goes into 180 8 times with a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 9161.8
If we subtract 168 from 180, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 8:
The number 21 fits into 120 5 times, leaving a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 9161.85
Subtracting 105 from 120 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 9:
21 goes into 150 7 times with a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 9161.857
Deduct 147 from 150 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 10:
If we divide 30 by 21, we get 1 and a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 9161.8571
The remainder is 9 after subtracting 21 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 11:
21 can be fit into 90 4 times, resulting in a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 9161.85714
If we subtract 84 from 90, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 12:
21 goes into 60 2 times with a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 9161.857142
The remainder is 18 after subtracting 42 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 13:
The number 21 fits into 180 8 times, leaving a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 9161.8571428
Subtracting 168 from 180 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 14:
The number 21 fits into 120 5 times, leaving a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 9161.85714285
Subtract 105 from 120 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

The final outcome is 9161.85714285, with a leftover of 1.5e-08.