We look at the division of 341239 by 42 
We want to figure out the number of times 341239 can be divided by 42.

Going ahead to step 1:
If we divide 3 by 42, we get 0 and a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Include the next digit (4) from the dividend after 3, then repeat: 34 / 42

Moving on to step 2:
If we divide 34 by 42, we get 0 and a remainder of 34.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 34 and we're left with 34.
Append the next digit (1) from the dividend to 34 and continue with: 341 / 42

Advancing to step 3:
42 can be fit into 341 8 times, resulting in a remainder of 5.
Use 8 as the next digit of our solution. 
Result so far: 8.0
If we take 336 away from 341, we end up with 5.
Take the next digit (2) from the dividend and append it to 5, then repeat: 52 / 42

Step 4:
52 divided by 42 is 1 with a remainder of 10.
The next digit of our result is 1. 
Result so far: 81.0
The remainder is 10 after subtracting 42 from 52.
Bring next digit (3) of the dividend behind the 10 and repeat the process: 103 / 42

Moving on to step 5:
42 goes into 103 2 times with a remainder of 19.
Use 2 as the next digit of our solution. 
Result so far: 812.0
The remainder is 19 after subtracting 84 from 103.
Include the next digit (9) from the dividend after 19, then repeat: 199 / 42

On to step 6:
When dividing 199 by 42, we get 4 with a remainder of 31.
The number 4 becomes the next digit in our result. 
Result so far: 8124.0
The remainder is 31 after subtracting 168 from 199.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

On to step 7:
42 can be fit into 310 7 times, resulting in a remainder of 16.
Use 7 as the next digit of our solution. 
Result so far: 8124.7
Deduct 294 from 310 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Advancing to step 8:
If we divide 160 by 42, we get 3 and a remainder of 34.
Record the quotient 3 as the next digit in the result. 
Result so far: 8124.73
Subtract 126 from 160 to get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

On to step 9:
340 divided by 42 is 8 with a remainder of 4.
Use 8 as the next digit of our solution. 
Result so far: 8124.738
Subtract 336 from 340 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 10:
42 goes into 40 0 times with a remainder of 40.
The next digit of our result is 0. 
Result so far: 8124.738
Subtracting 0 from 40 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 11:
42 can be fit into 400 9 times, resulting in a remainder of 22.
The next digit of our result is 9. 
Result so far: 8124.73809
If we subtract 378 from 400, we get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Moving on to step 12:
If we divide 220 by 42, we get 5 and a remainder of 10.
Write down 5 as next digit of the result. 
Result so far: 8124.738095
Deduct 210 from 220 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 13:
100 divided by 42 is 2 with a remainder of 16.
The next digit of our result is 2. 
Result so far: 8124.7380952
If we take 84 away from 100, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 14:
160 divided by 42 is 3 with a remainder of 34.
Use 3 as the next digit of our solution. 
Result so far: 8124.73809523
If we take 126 away from 160, we end up 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.

Our division results in 8124.73809523 with a remaining 3.4e-08.