We divide 510140 by 12
We want to divide 510140 by 12.

Going ahead to step 1:
When dividing 5 by 12, we get 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 12

Going ahead to step 2:
When dividing 51 by 12, we get 4 with a remainder of 3.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
If we subtract 48 from 51, we get 3.
Grab the next digit (0) from the dividend, add it to 3, then carry on: 30 / 12

Step 3:
The number 12 fits into 30 2 times, leaving a remainder of 6.
Write down 2 as next digit of the result. 
Result so far: 42.0
Deduct 24 from 30 and we're left with 6.
Fetch the next digit (1) from the dividend, attach it to 6 and continue: 61 / 12

Let's proceed to step 4:
61 divided by 12 is 5 with a remainder of 1.
The next digit of our result is 5. 
Result so far: 425.0
Subtract 60 from 61 to get 1.
Fetch the next digit (4) from the dividend, attach it to 1 and continue: 14 / 12

Let's proceed to step 5:
14 divided by 12 is 1 with a remainder of 2.
Write down 1 as next digit of the result. 
Result so far: 4251.0
Subtract 12 from 14 to get 2.
Take the next digit (0) from the dividend and append it to 2, then repeat: 20 / 12

On to step 6:
12 can be fit into 20 1 times, resulting in a remainder of 8.
Write down 1 as next digit of the result. 
Result so far: 42511.0
The remainder is 8 after subtracting 12 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 7:
12 can be fit into 80 6 times, resulting in a remainder of 8.
Put 6 as the next digit of the answer. 
Result so far: 42511.6
If we take 72 away from 80, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 8:
When dividing 80 by 12, we get 6 with a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 42511.66
Subtract 72 from 80 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final outcome is 42511.66, with a leftover of 0.008.