We're dividing 42185468 by 309 
We want to divide 42185468 by 309.

Going ahead to step 1:
4 divided by 309 is 0 with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Bring next digit (2) of the dividend behind the 4 and repeat the process: 42 / 309

Moving on to step 2:
When dividing 42 by 309, we get 0 with a remainder of 42.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 42, we end up with 42.
Append the next digit (1) from the dividend to 42 and continue with: 421 / 309

Step 3:
309 can be fit into 421 1 times, resulting in a remainder of 112.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 309 from 421 leaves us with 112.
Take the next digit (8) from the dividend and append it to 112, then repeat: 1128 / 309

Going ahead to step 4:
When dividing 1128 by 309, we get 3 with a remainder of 201.
The next digit of our result is 3. 
Result so far: 13.0
Subtract 927 from 1128 to get 201.
Include the next digit (5) from the dividend after 201, then repeat: 2015 / 309

Advancing to step 5:
If we divide 2015 by 309, we get 6 and a remainder of 161.
Put 6 as the next digit of the answer. 
Result so far: 136.0
If we subtract 1854 from 2015, we get 161.
Bring next digit (4) of the dividend behind the 161 and repeat the process: 1614 / 309

On to step 6:
309 goes into 1614 5 times with a remainder of 69.
The number 5 becomes the next digit in our result. 
Result so far: 1365.0
If we take 1545 away from 1614, we end up with 69.
Grab the next digit (6) from the dividend, add it to 69, then carry on: 696 / 309

Advancing to step 7:
309 can be fit into 696 2 times, resulting in a remainder of 78.
Write down 2 as next digit of the result. 
Result so far: 13652.0
Deduct 618 from 696 and we're left with 78.
Fetch the next digit (8) from the dividend, attach it to 78 and continue: 788 / 309

Advancing to step 8:
309 can be fit into 788 2 times, resulting in a remainder of 170.
Use 2 as the next digit of our solution. 
Result so far: 136522.0
Subtract 618 from 788 to get 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Going ahead to step 9:
If we divide 1700 by 309, we get 5 and a remainder of 155.
Put 5 as the next digit of the answer. 
Result so far: 136522.5
If we subtract 1545 from 1700, we get 155.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1550, and continue the process.

Let's proceed to step 10:
1550 divided by 309 is 5 with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 136522.55
The remainder is 5 after subtracting 1545 from 1550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The final result is 136522.55 with a remainder of 0.005.