142123 ÷ 42 
Let's see how many times 42 fits into 142123.

Going ahead to step 1:
42 can be fit into 1 0 times, resulting in a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Take the next digit (4) from the dividend and append it to 1, then repeat: 14 / 42

On to step 2:
The number 42 fits into 14 0 times, leaving a remainder of 14.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 14, we get 14.
Fetch the next digit (2) from the dividend, attach it to 14 and continue: 142 / 42

Moving on to step 3:
42 can be fit into 142 3 times, resulting in a remainder of 16.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we take 126 away from 142, we end up with 16.
Bring next digit (1) of the dividend behind the 16 and repeat the process: 161 / 42

Moving on to step 4:
161 divided by 42 is 3 with a remainder of 35.
Write down 3 as next digit of the result. 
Result so far: 33.0
Subtract 126 from 161 to get 35.
Grab the next digit (2) from the dividend, add it to 35, then carry on: 352 / 42

Going ahead to step 5:
42 goes into 352 8 times with a remainder of 16.
Record the quotient 8 as the next digit in the result. 
Result so far: 338.0
Subtracting 336 from 352 leaves us with 16.
Grab the next digit (3) from the dividend, add it to 16, then carry on: 163 / 42

Step 6:
The number 42 fits into 163 3 times, leaving a remainder of 37.
Use 3 as the next digit of our solution. 
Result so far: 3383.0
Deduct 126 from 163 and we're left with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Going ahead to step 7:
If we divide 370 by 42, we get 8 and a remainder of 34.
The next digit of our result is 8. 
Result so far: 3383.8
Subtracting 336 from 370 leaves us with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Let's proceed to step 8:
If we divide 340 by 42, we get 8 and a remainder of 4.
The number 8 becomes the next digit in our result. 
Result so far: 3383.88
Subtracting 336 from 340 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

In conclusion, the division gives 3383.88 with a balance of 0.004.