We're dividing 159942 by 18 
We want to divide 159942 by 18.

Going ahead to step 1:
1 divided by 18 is 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 18

Moving on to step 2:
18 goes into 15 0 times with a remainder of 15.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 15, we get 15.
Include the next digit (9) from the dividend after 15, then repeat: 159 / 18

Let's proceed to step 3:
When dividing 159 by 18, we get 8 with a remainder of 15.
Put 8 as the next digit of the answer. 
Result so far: 8.0
Deduct 144 from 159 and we're left with 15.
Include the next digit (9) from the dividend after 15, then repeat: 159 / 18

Step 4:
The number 18 fits into 159 8 times, leaving a remainder of 15.
Use 8 as the next digit of our solution. 
Result so far: 88.0
If we take 144 away from 159, we end up with 15.
Include the next digit (4) from the dividend after 15, then repeat: 154 / 18

On to step 5:
If we divide 154 by 18, we get 8 and a remainder of 10.
The number 8 becomes the next digit in our result. 
Result so far: 888.0
Subtracting 144 from 154 leaves us with 10.
Take the next digit (2) from the dividend and append it to 10, then repeat: 102 / 18

Step 6:
102 divided by 18 is 5 with a remainder of 12.
Put 5 as the next digit of the answer. 
Result so far: 8885.0
Subtract 90 from 102 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 7:
If we divide 120 by 18, we get 6 and a remainder of 12.
The number 6 becomes the next digit in our result. 
Result so far: 8885.6
If we subtract 108 from 120, we get 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.
Put 6 as the next digit of the answer. 
Result so far: 8885.66
Subtract 108 from 120 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Our division results in 8885.66 with a remaining 0.012.