383429 divided by 21 
Our goal is to divide 383429 by 21.

Step 1:
The number 21 fits into 3 0 times, leaving a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Include the next digit (8) from the dividend after 3, then repeat: 38 / 21

On to step 2:
The number 21 fits into 38 1 times, leaving a remainder of 17.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 21 from 38 leaves us with 17.
Include the next digit (3) from the dividend after 17, then repeat: 173 / 21

Step 3:
When dividing 173 by 21, we get 8 with a remainder of 5.
Write down 8 as next digit of the result. 
Result so far: 18.0
The remainder is 5 after subtracting 168 from 173.
Bring next digit (4) of the dividend behind the 5 and repeat the process: 54 / 21

Step 4:
21 can be fit into 54 2 times, resulting in a remainder of 12.
The number 2 becomes the next digit in our result. 
Result so far: 182.0
Subtracting 42 from 54 leaves us with 12.
Grab the next digit (2) from the dividend, add it to 12, then carry on: 122 / 21

Let's proceed to step 5:
When dividing 122 by 21, we get 5 with a remainder of 17.
Use 5 as the next digit of our solution. 
Result so far: 1825.0
Deduct 105 from 122 and we're left with 17.
Bring next digit (9) of the dividend behind the 17 and repeat the process: 179 / 21

Moving on to step 6:
When dividing 179 by 21, we get 8 with a remainder of 11.
The number 8 becomes the next digit in our result. 
Result so far: 18258.0
The remainder is 11 after subtracting 168 from 179.
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 7:
21 goes into 110 5 times with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 18258.5
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.

Advancing to step 8:
When dividing 50 by 21, we get 2 with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 18258.52
If we subtract 42 from 50, we get 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 9:
21 can be fit into 80 3 times, resulting in a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 18258.523
Subtracting 63 from 80 leaves us 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.

Step 10:
170 divided by 21 is 8 with a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 18258.5238
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.

Going ahead to step 11:
21 goes into 20 0 times with a remainder of 20.
The next digit of our result is 0. 
Result so far: 18258.5238
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 12:
If we divide 200 by 21, we get 9 and a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 18258.523809
Deduct 189 from 200 and we're left 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.

On to step 13:
110 divided by 21 is 5 with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 18258.5238095
If we take 105 away from 110, we end up 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 14:
When dividing 50 by 21, we get 2 with a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 18258.52380952
Deduct 42 from 50 and we're left 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.

Our division results in 18258.52380952 with a remaining 8e-09.