We divide 420042 by 18
We're looking to find how many times 18 goes into 420042.

Going ahead to step 1:
The number 18 fits into 4 0 times, leaving a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Include the next digit (2) from the dividend after 4, then repeat: 42 / 18

Moving on to step 2:
When dividing 42 by 18, we get 2 with a remainder of 6.
The next digit of our result is 2. 
Result so far: 2.0
Subtract 36 from 42 to get 6.
Grab the next digit (0) from the dividend, add it to 6, then carry on: 60 / 18

Let's proceed to step 3:
18 can be fit into 60 3 times, resulting in a remainder of 6.
Record the quotient 3 as the next digit in the result. 
Result so far: 23.0
If we take 54 away from 60, we end up with 6.
Grab the next digit (0) from the dividend, add it to 6, then carry on: 60 / 18

On to step 4:
18 goes into 60 3 times with a remainder of 6.
Record the quotient 3 as the next digit in the result. 
Result so far: 233.0
The remainder is 6 after subtracting 54 from 60.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 18

On to step 5:
18 goes into 64 3 times with a remainder of 10.
Write down 3 as next digit of the result. 
Result so far: 2333.0
If we subtract 54 from 64, we get 10.
Fetch the next digit (2) from the dividend, attach it to 10 and continue: 102 / 18

On to step 6:
If we divide 102 by 18, we get 5 and a remainder of 12.
Write down 5 as next digit of the result. 
Result so far: 23335.0
If we take 90 away from 102, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 7:
18 goes into 120 6 times with a remainder of 12.
The next digit of our result is 6. 
Result so far: 23335.6
Deduct 108 from 120 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 8:
120 divided by 18 is 6 with a remainder of 12.
Record the quotient 6 as the next digit in the result. 
Result so far: 23335.66
Subtracting 108 from 120 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

In conclusion, the division gives 23335.66 with a balance of 0.012.