We're dividing 339454 by 42 
We want to divide 339454 by 42.

Step 1:
42 goes into 3 0 times with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Bring next digit (3) of the dividend behind the 3 and repeat the process: 33 / 42

Step 2:
42 goes into 33 0 times with a remainder of 33.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 33 after subtracting 0 from 33.
Bring next digit (9) of the dividend behind the 33 and repeat the process: 339 / 42

Let's proceed to step 3:
When dividing 339 by 42, we get 8 with a remainder of 3.
The next digit of our result is 8. 
Result so far: 8.0
The remainder is 3 after subtracting 336 from 339.
Grab the next digit (4) from the dividend, add it to 3, then carry on: 34 / 42

Going ahead to step 4:
42 goes into 34 0 times with a remainder of 34.
Put 0 as the next digit of the answer. 
Result so far: 80.0
The remainder is 34 after subtracting 0 from 34.
Bring next digit (5) of the dividend behind the 34 and repeat the process: 345 / 42

Going ahead to step 5:
42 can be fit into 345 8 times, resulting in a remainder of 9.
Write down 8 as next digit of the result. 
Result so far: 808.0
Subtract 336 from 345 to get 9.
Grab the next digit (4) from the dividend, add it to 9, then carry on: 94 / 42

Step 6:
The number 42 fits into 94 2 times, leaving a remainder of 10.
Put 2 as the next digit of the answer. 
Result so far: 8082.0
The remainder is 10 after subtracting 84 from 94.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 7:
The number 42 fits into 100 2 times, leaving a remainder of 16.
The next digit of our result is 2. 
Result so far: 8082.2
Deduct 84 from 100 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.

Step 8:
42 goes into 160 3 times with a remainder of 34.
Use 3 as the next digit of our solution. 
Result so far: 8082.23
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.

Moving on to step 9:
42 can be fit into 340 8 times, resulting in a remainder of 4.
The next digit of our result is 8. 
Result so far: 8082.238
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.

Advancing to step 10:
When dividing 40 by 42, we get 0 with a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 8082.238
The remainder is 40 after subtracting 0 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 11:
42 goes into 400 9 times with a remainder of 22.
Write down 9 as next digit of the result. 
Result so far: 8082.23809
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.

Going ahead to step 12:
42 can be fit into 220 5 times, resulting in a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 8082.238095
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.

Going ahead to step 13:
The number 42 fits into 100 2 times, leaving a remainder of 16.
The number 2 becomes the next digit in our result. 
Result so far: 8082.2380952
Subtract 84 from 100 to get 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 14:
42 can be fit into 160 3 times, resulting in a remainder of 34.
Put 3 as the next digit of the answer. 
Result so far: 8082.23809523
The remainder is 34 after subtracting 126 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

After the division, we end up with 8082.23809523 and a remainder of 3.4e-08.