We look at the division of 351201 by 42 
We want to divide 351201 by 42.

Step 1:
When dividing 3 by 42, we get 0 with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Fetch the next digit (5) from the dividend, attach it to 3 and continue: 35 / 42

Advancing to step 2:
42 goes into 35 0 times with a remainder of 35.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 35, we get 35.
Fetch the next digit (1) from the dividend, attach it to 35 and continue: 351 / 42

Step 3:
42 can be fit into 351 8 times, resulting in a remainder of 15.
The next digit of our result is 8. 
Result so far: 8.0
The remainder is 15 after subtracting 336 from 351.
Bring next digit (2) of the dividend behind the 15 and repeat the process: 152 / 42

Going ahead to step 4:
The number 42 fits into 152 3 times, leaving a remainder of 26.
The number 3 becomes the next digit in our result. 
Result so far: 83.0
Deduct 126 from 152 and we're left with 26.
Include the next digit (0) from the dividend after 26, then repeat: 260 / 42

On to step 5:
42 can be fit into 260 6 times, resulting in a remainder of 8.
The next digit of our result is 6. 
Result so far: 836.0
If we take 252 away from 260, we end up with 8.
Grab the next digit (1) from the dividend, add it to 8, then carry on: 81 / 42

Step 6:
42 can be fit into 81 1 times, resulting in a remainder of 39.
The number 1 becomes the next digit in our result. 
Result so far: 8361.0
If we subtract 42 from 81, we get 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Going ahead to step 7:
42 goes into 390 9 times with a remainder of 12.
Use 9 as the next digit of our solution. 
Result so far: 8361.9
If we subtract 378 from 390, 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.

Going ahead to step 8:
120 divided by 42 is 2 with a remainder of 36.
The next digit of our result is 2. 
Result so far: 8361.92
If we subtract 84 from 120, we get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Advancing to step 9:
42 goes into 360 8 times with a remainder of 24.
Record the quotient 8 as the next digit in the result. 
Result so far: 8361.928
Subtracting 336 from 360 leaves us with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

On to step 10:
240 divided by 42 is 5 with a remainder of 30.
Record the quotient 5 as the next digit in the result. 
Result so far: 8361.9285
If we subtract 210 from 240, we 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.

Let's proceed to step 11:
42 can be fit into 300 7 times, resulting in a remainder of 6.
Write down 7 as next digit of the result. 
Result so far: 8361.92857
If we subtract 294 from 300, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 12:
42 goes into 60 1 times with a remainder of 18.
The number 1 becomes the next digit in our result. 
Result so far: 8361.928571
Subtract 42 from 60 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 13:
The number 42 fits into 180 4 times, leaving a remainder of 12.
The next digit of our result is 4. 
Result so far: 8361.9285714
If we subtract 168 from 180, 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.

On to step 14:
The number 42 fits into 120 2 times, leaving a remainder of 36.
Put 2 as the next digit of the answer. 
Result so far: 8361.92857142
If we subtract 84 from 120, we get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

The final outcome is 8361.92857142, with a leftover of 3.6e-08.