We look at the division of 309484 by 42 
Our goal is to divide 309484 by 42.

On to step 1:
42 goes into 3 0 times with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Grab the next digit (0) from the dividend, add it to 3, then carry on: 30 / 42

Step 2:
42 can be fit into 30 0 times, resulting in a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 30 to get 30.
Bring next digit (9) of the dividend behind the 30 and repeat the process: 309 / 42

Moving on to step 3:
42 goes into 309 7 times with a remainder of 15.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
If we subtract 294 from 309, we get 15.
Append the next digit (4) from the dividend to 15 and continue with: 154 / 42

Step 4:
When dividing 154 by 42, we get 3 with a remainder of 28.
The number 3 becomes the next digit in our result. 
Result so far: 73.0
If we take 126 away from 154, we end up with 28.
Bring next digit (8) of the dividend behind the 28 and repeat the process: 288 / 42

Going ahead to step 5:
If we divide 288 by 42, we get 6 and a remainder of 36.
Put 6 as the next digit of the answer. 
Result so far: 736.0
If we subtract 252 from 288, we get 36.
Take the next digit (4) from the dividend and append it to 36, then repeat: 364 / 42

On to step 6:
42 goes into 364 8 times with a remainder of 28.
Write down 8 as next digit of the result. 
Result so far: 7368.0
The remainder is 28 after subtracting 336 from 364.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Step 7:
280 divided by 42 is 6 with a remainder of 28.
Use 6 as the next digit of our solution. 
Result so far: 7368.6
If we take 252 away from 280, we end up with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Let's proceed to step 8:
The number 42 fits into 280 6 times, leaving a remainder of 28.
Write down 6 as next digit of the result. 
Result so far: 7368.66
If we take 252 away from 280, we end up with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

The final result is 7368.66 with a remainder of 0.028.