Let's divide 42078040 by 285
We're looking to find how many times 285 goes into 42078040.

Step 1:
The number 285 fits into 4 0 times, leaving a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Append the next digit (2) from the dividend to 4 and continue with: 42 / 285

Going ahead to step 2:
The number 285 fits into 42 0 times, leaving a remainder of 42.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 42 after subtracting 0 from 42.
Grab the next digit (0) from the dividend, add it to 42, then carry on: 420 / 285

Going ahead to step 3:
420 divided by 285 is 1 with a remainder of 135.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 285 from 420 leaves us with 135.
Bring next digit (7) of the dividend behind the 135 and repeat the process: 1357 / 285

Let's proceed to step 4:
If we divide 1357 by 285, we get 4 and a remainder of 217.
Write down 4 as next digit of the result. 
Result so far: 14.0
Subtract 1140 from 1357 to get 217.
Take the next digit (8) from the dividend and append it to 217, then repeat: 2178 / 285

Going ahead to step 5:
285 can be fit into 2178 7 times, resulting in a remainder of 183.
Use 7 as the next digit of our solution. 
Result so far: 147.0
If we take 1995 away from 2178, we end up with 183.
Bring next digit (0) of the dividend behind the 183 and repeat the process: 1830 / 285

Going ahead to step 6:
285 goes into 1830 6 times with a remainder of 120.
The next digit of our result is 6. 
Result so far: 1476.0
Subtract 1710 from 1830 to get 120.
Include the next digit (4) from the dividend after 120, then repeat: 1204 / 285

Step 7:
When dividing 1204 by 285, we get 4 with a remainder of 64.
The next digit of our result is 4. 
Result so far: 14764.0
If we take 1140 away from 1204, we end up with 64.
Take the next digit (0) from the dividend and append it to 64, then repeat: 640 / 285

On to step 8:
640 divided by 285 is 2 with a remainder of 70.
The number 2 becomes the next digit in our result. 
Result so far: 147642.0
Deduct 570 from 640 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Advancing to step 9:
285 can be fit into 700 2 times, resulting in a remainder of 130.
Record the quotient 2 as the next digit in the result. 
Result so far: 147642.2
If we subtract 570 from 700, we get 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Going ahead to step 10:
If we divide 1300 by 285, we get 4 and a remainder of 160.
Put 4 as the next digit of the answer. 
Result so far: 147642.24
If we take 1140 away from 1300, we end up with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Moving on to step 11:
1600 divided by 285 is 5 with a remainder of 175.
Use 5 as the next digit of our solution. 
Result so far: 147642.245
If we take 1425 away from 1600, we end up with 175.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1750, and continue the process.

Advancing to step 12:
1750 divided by 285 is 6 with a remainder of 40.
Put 6 as the next digit of the answer. 
Result so far: 147642.2456
The remainder is 40 after subtracting 1710 from 1750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 13:
When dividing 400 by 285, we get 1 with a remainder of 115.
Use 1 as the next digit of our solution. 
Result so far: 147642.24561
Deduct 285 from 400 and we're left with 115.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1150, and continue the process.

Going ahead to step 14:
The number 285 fits into 1150 4 times, leaving a remainder of 10.
The number 4 becomes the next digit in our result. 
Result so far: 147642.245614
If we take 1140 away from 1150, we end up 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.

Moving on to step 15:
When dividing 100 by 285, we get 0 with a remainder of 100.
Use 0 as the next digit of our solution. 
Result so far: 147642.245614
The remainder is 100 after subtracting 0 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Advancing to step 16:
When dividing 1000 by 285, we get 3 with a remainder of 145.
The number 3 becomes the next digit in our result. 
Result so far: 147642.24561403
If we subtract 855 from 1000, we get 145.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

The final outcome is 147642.24561403, with a leftover of 1.45e-07.