We look at the division of 20424234 by 399 
Our goal is to divide 20424234 by 399.

Going ahead to step 1:
When dividing 2 by 399, we get 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Append the next digit (0) from the dividend to 2 and continue with: 20 / 399

Let's proceed to step 2:
If we divide 20 by 399, we get 0 and a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 20, we end up with 20.
Grab the next digit (4) from the dividend, add it to 20, then carry on: 204 / 399

On to step 3:
204 divided by 399 is 0 with a remainder of 204.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 204, we get 204.
Take the next digit (2) from the dividend and append it to 204, then repeat: 2042 / 399

Let's proceed to step 4:
399 can be fit into 2042 5 times, resulting in a remainder of 47.
Use 5 as the next digit of our solution. 
Result so far: 5.0
Subtracting 1995 from 2042 leaves us with 47.
Take the next digit (4) from the dividend and append it to 47, then repeat: 474 / 399

On to step 5:
399 goes into 474 1 times with a remainder of 75.
Use 1 as the next digit of our solution. 
Result so far: 51.0
The remainder is 75 after subtracting 399 from 474.
Include the next digit (2) from the dividend after 75, then repeat: 752 / 399

Advancing to step 6:
If we divide 752 by 399, we get 1 and a remainder of 353.
Record the quotient 1 as the next digit in the result. 
Result so far: 511.0
The remainder is 353 after subtracting 399 from 752.
Take the next digit (3) from the dividend and append it to 353, then repeat: 3533 / 399

On to step 7:
3533 divided by 399 is 8 with a remainder of 341.
Record the quotient 8 as the next digit in the result. 
Result so far: 5118.0
If we take 3192 away from 3533, we end up with 341.
Take the next digit (4) from the dividend and append it to 341, then repeat: 3414 / 399

Let's proceed to step 8:
3414 divided by 399 is 8 with a remainder of 222.
Record the quotient 8 as the next digit in the result. 
Result so far: 51188.0
Subtract 3192 from 3414 to get 222.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2220, and continue the process.

Advancing to step 9:
399 goes into 2220 5 times with a remainder of 225.
Put 5 as the next digit of the answer. 
Result so far: 51188.5
If we take 1995 away from 2220, we end up with 225.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2250, and continue the process.

Step 10:
If we divide 2250 by 399, we get 5 and a remainder of 255.
Use 5 as the next digit of our solution. 
Result so far: 51188.55
Deduct 1995 from 2250 and we're left with 255.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2550, and continue the process.

In conclusion, the division gives 51188.55 with a balance of 0.255.