We look at the division of 331744 by 21 
Let's see how many times 21 fits into 331744.

Step 1:
3 divided by 21 is 0 with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Take the next digit (3) from the dividend and append it to 3, then repeat: 33 / 21

Advancing to step 2:
If we divide 33 by 21, we get 1 and a remainder of 12.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 21 from 33 and we're left with 12.
Take the next digit (1) from the dividend and append it to 12, then repeat: 121 / 21

On to step 3:
When dividing 121 by 21, we get 5 with a remainder of 16.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
If we subtract 105 from 121, we get 16.
Bring next digit (7) of the dividend behind the 16 and repeat the process: 167 / 21

Moving on to step 4:
If we divide 167 by 21, we get 7 and a remainder of 20.
Record the quotient 7 as the next digit in the result. 
Result so far: 157.0
If we subtract 147 from 167, we get 20.
Include the next digit (4) from the dividend after 20, then repeat: 204 / 21

Let's proceed to step 5:
21 goes into 204 9 times with a remainder of 15.
The next digit of our result is 9. 
Result so far: 1579.0
If we take 189 away from 204, we end up with 15.
Fetch the next digit (4) from the dividend, attach it to 15 and continue: 154 / 21

Step 6:
If we divide 154 by 21, we get 7 and a remainder of 7.
Put 7 as the next digit of the answer. 
Result so far: 15797.0
If we take 147 away from 154, we end up with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Going ahead to step 7:
If we divide 70 by 21, we get 3 and a remainder of 7.
The next digit of our result is 3. 
Result so far: 15797.3
Deduct 63 from 70 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 8:
If we divide 70 by 21, we get 3 and a remainder of 7.
Write down 3 as next digit of the result. 
Result so far: 15797.33
If we subtract 63 from 70, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

The final outcome is 15797.33, with a leftover of 0.007.