We divide 19929 by 21
We want to figure out the number of times 19929 can be divided by 21.

Step 1:
21 goes into 1 0 times with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Fetch the next digit (9) from the dividend, attach it to 1 and continue: 19 / 21

Let's proceed to step 2:
When dividing 19 by 21, we get 0 with a remainder of 19.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 19 to get 19.
Fetch the next digit (9) from the dividend, attach it to 19 and continue: 199 / 21

Going ahead to step 3:
21 can be fit into 199 9 times, resulting in a remainder of 10.
The next digit of our result is 9. 
Result so far: 9.0
If we subtract 189 from 199, we get 10.
Append the next digit (2) from the dividend to 10 and continue with: 102 / 21

Advancing to step 4:
The number 21 fits into 102 4 times, leaving a remainder of 18.
Use 4 as the next digit of our solution. 
Result so far: 94.0
The remainder is 18 after subtracting 84 from 102.
Grab the next digit (9) from the dividend, add it to 18, then carry on: 189 / 21

Advancing to step 5:
If we divide 189 by 21, we get 9 and a remainder of 0.
The next digit of our result is 9. 
Result so far: 949.0
Deduct 189 from 189 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.

Going ahead to step 6:
0 divided by 21 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 949.0
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.

Let's proceed to step 7:
The number 21 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 949.0
If we subtract 0 from 0, we 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.

Our division results in 949.0 with a remaining 0.0.