We're dividing 629402 by 21 
We're looking to find how many times 21 goes into 629402.

Step 1:
6 divided by 21 is 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Bring next digit (2) of the dividend behind the 6 and repeat the process: 62 / 21

On to step 2:
21 goes into 62 2 times with a remainder of 20.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtracting 42 from 62 leaves us with 20.
Append the next digit (9) from the dividend to 20 and continue with: 209 / 21

Moving on to step 3:
If we divide 209 by 21, we get 9 and a remainder of 20.
Record the quotient 9 as the next digit in the result. 
Result so far: 29.0
Deduct 189 from 209 and we're left with 20.
Bring next digit (4) of the dividend behind the 20 and repeat the process: 204 / 21

Step 4:
When dividing 204 by 21, we get 9 with a remainder of 15.
Use 9 as the next digit of our solution. 
Result so far: 299.0
The remainder is 15 after subtracting 189 from 204.
Append the next digit (0) from the dividend to 15 and continue with: 150 / 21

On to step 5:
150 divided by 21 is 7 with a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 2997.0
If we subtract 147 from 150, we get 3.
Append the next digit (2) from the dividend to 3 and continue with: 32 / 21

Advancing to step 6:
32 divided by 21 is 1 with a remainder of 11.
Use 1 as the next digit of our solution. 
Result so far: 29971.0
If we take 21 away from 32, we end up 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.

Step 7:
The number 21 fits into 110 5 times, leaving a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 29971.5
Subtracting 105 from 110 leaves us 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.

Advancing to step 8:
50 divided by 21 is 2 with a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 29971.52
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.

Step 9:
The number 21 fits into 80 3 times, leaving a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 29971.523
If we take 63 away from 80, we end up 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.

Moving on to 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: 29971.5238
If we take 168 away from 170, we end up 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.

Let's proceed to step 11:
The number 21 fits into 20 0 times, leaving a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 29971.5238
Deduct 0 from 20 and we're left 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:
200 divided by 21 is 9 with a remainder of 11.
The next digit of our result is 9. 
Result so far: 29971.523809
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.

Step 13:
21 can be fit into 110 5 times, resulting in a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 29971.5238095
The remainder is 5 after subtracting 105 from 110.
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:
If we divide 50 by 21, we get 2 and a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 29971.52380952
Subtract 42 from 50 to 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.

In conclusion, the division gives 29971.52380952 with a balance of 8e-09.