We're dividing 142551 by 42 
Our goal is to divide 142551 by 42.

Step 1:
1 divided by 42 is 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Append the next digit (4) from the dividend to 1 and continue with: 14 / 42

Step 2:
When dividing 14 by 42, we get 0 with a remainder of 14.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 14 leaves us with 14.
Bring next digit (2) of the dividend behind the 14 and repeat the process: 142 / 42

Moving on to step 3:
142 divided by 42 is 3 with a remainder of 16.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we take 126 away from 142, we end up with 16.
Bring next digit (5) of the dividend behind the 16 and repeat the process: 165 / 42

Advancing to step 4:
The number 42 fits into 165 3 times, leaving a remainder of 39.
The number 3 becomes the next digit in our result. 
Result so far: 33.0
Subtract 126 from 165 to get 39.
Bring next digit (5) of the dividend behind the 39 and repeat the process: 395 / 42

Step 5:
The number 42 fits into 395 9 times, leaving a remainder of 17.
Write down 9 as next digit of the result. 
Result so far: 339.0
Subtract 378 from 395 to get 17.
Fetch the next digit (1) from the dividend, attach it to 17 and continue: 171 / 42

Moving on to step 6:
42 can be fit into 171 4 times, resulting in a remainder of 3.
The number 4 becomes the next digit in our result. 
Result so far: 3394.0
Subtracting 168 from 171 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 7:
30 divided by 42 is 0 with a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 3394.0
Subtract 0 from 30 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 8:
300 divided by 42 is 7 with a remainder of 6.
Put 7 as the next digit of the answer. 
Result so far: 3394.07
The remainder is 6 after subtracting 294 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 9:
When dividing 60 by 42, we get 1 with a remainder of 18.
Write down 1 as next digit of the result. 
Result so far: 3394.071
Deduct 42 from 60 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 10:
If we divide 180 by 42, we get 4 and a remainder of 12.
Write down 4 as next digit of the result. 
Result so far: 3394.0714
Subtract 168 from 180 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.

On to step 11:
120 divided by 42 is 2 with a remainder of 36.
Put 2 as the next digit of the answer. 
Result so far: 3394.07142
Subtracting 84 from 120 leaves us with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Going ahead to step 12:
42 goes into 360 8 times with a remainder of 24.
The number 8 becomes the next digit in our result. 
Result so far: 3394.071428
If we subtract 336 from 360, we get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Let's proceed to step 13:
42 goes into 240 5 times with a remainder of 30.
Record the quotient 5 as the next digit in the result. 
Result so far: 3394.0714285
The remainder is 30 after subtracting 210 from 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 14:
The number 42 fits into 300 7 times, leaving a remainder of 6.
The next digit of our result is 7. 
Result so far: 3394.07142857
The remainder is 6 after subtracting 294 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

In conclusion, the division gives 3394.07142857 with a balance of 6e-09.