We divide 423898 by 12
Our goal is to divide 423898 by 12.

Step 1:
If we divide 4 by 12, we get 0 and a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Take the next digit (2) from the dividend and append it to 4, then repeat: 42 / 12

Step 2:
12 goes into 42 3 times with a remainder of 6.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
The remainder is 6 after subtracting 36 from 42.
Grab the next digit (3) from the dividend, add it to 6, then carry on: 63 / 12

On to step 3:
63 divided by 12 is 5 with a remainder of 3.
Record the quotient 5 as the next digit in the result. 
Result so far: 35.0
If we subtract 60 from 63, we get 3.
Include the next digit (8) from the dividend after 3, then repeat: 38 / 12

Advancing to step 4:
If we divide 38 by 12, we get 3 and a remainder of 2.
Write down 3 as next digit of the result. 
Result so far: 353.0
Subtract 36 from 38 to get 2.
Fetch the next digit (9) from the dividend, attach it to 2 and continue: 29 / 12

Going ahead to step 5:
When dividing 29 by 12, we get 2 with a remainder of 5.
The next digit of our result is 2. 
Result so far: 3532.0
If we subtract 24 from 29, we get 5.
Include the next digit (8) from the dividend after 5, then repeat: 58 / 12

Moving on to step 6:
12 goes into 58 4 times with a remainder of 10.
The next digit of our result is 4. 
Result so far: 35324.0
Deduct 48 from 58 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 7:
12 goes into 100 8 times with a remainder of 4.
Put 8 as the next digit of the answer. 
Result so far: 35324.8
The remainder is 4 after subtracting 96 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 8:
When dividing 40 by 12, we get 3 with a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 35324.83
Subtract 36 from 40 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 9:
12 goes into 40 3 times with a remainder of 4.
The next digit of our result is 3. 
Result so far: 35324.833
The remainder is 4 after subtracting 36 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The final outcome is 35324.833, with a leftover of 0.0004.