We look at the division of 999368 by 21 
Let's see how many times 21 fits into 999368.

Moving on to step 1:
21 goes into 9 0 times with a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Grab the next digit (9) from the dividend, add it to 9, then carry on: 99 / 21

Going ahead to step 2:
99 divided by 21 is 4 with a remainder of 15.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
If we take 84 away from 99, we end up with 15.
Include the next digit (9) from the dividend after 15, then repeat: 159 / 21

On to step 3:
159 divided by 21 is 7 with a remainder of 12.
The next digit of our result is 7. 
Result so far: 47.0
Deduct 147 from 159 and we're left with 12.
Include the next digit (3) from the dividend after 12, then repeat: 123 / 21

Advancing to step 4:
21 goes into 123 5 times with a remainder of 18.
The number 5 becomes the next digit in our result. 
Result so far: 475.0
Subtracting 105 from 123 leaves us with 18.
Append the next digit (6) from the dividend to 18 and continue with: 186 / 21

Moving on to step 5:
21 can be fit into 186 8 times, resulting in a remainder of 18.
Put 8 as the next digit of the answer. 
Result so far: 4758.0
Subtract 168 from 186 to get 18.
Include the next digit (8) from the dividend after 18, then repeat: 188 / 21

Advancing to step 6:
188 divided by 21 is 8 with a remainder of 20.
Put 8 as the next digit of the answer. 
Result so far: 47588.0
If we subtract 168 from 188, 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.

Let's proceed to step 7:
If we divide 200 by 21, we get 9 and a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 47588.9
Subtract 189 from 200 to get 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 8:
21 goes into 110 5 times with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 47588.95
If we subtract 105 from 110, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 9:
21 goes into 50 2 times with a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 47588.952
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 10:
If we divide 80 by 21, we get 3 and a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 47588.9523
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.

Going ahead to step 11:
The number 21 fits into 170 8 times, leaving a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 47588.95238
Subtracting 168 from 170 leaves us 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.

Advancing to step 12:
If we divide 20 by 21, we get 0 and a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 47588.95238
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.

Advancing to step 13:
21 can be fit into 200 9 times, resulting in a remainder of 11.
The next digit of our result is 9. 
Result so far: 47588.9523809
Subtracting 189 from 200 leaves us 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.

Let's proceed to step 14:
21 goes into 110 5 times with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 47588.95238095
If we subtract 105 from 110, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The final outcome is 47588.95238095, with a leftover of 5e-09.