Let's divide 285939 by 12
We want to divide 285939 by 12.

Advancing to step 1:
The number 12 fits into 2 0 times, leaving a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Append the next digit (8) from the dividend to 2 and continue with: 28 / 12

Step 2:
12 can be fit into 28 2 times, resulting in a remainder of 4.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Deduct 24 from 28 and we're left with 4.
Bring next digit (5) of the dividend behind the 4 and repeat the process: 45 / 12

Step 3:
When dividing 45 by 12, we get 3 with a remainder of 9.
Record the quotient 3 as the next digit in the result. 
Result so far: 23.0
If we take 36 away from 45, we end up with 9.
Grab the next digit (9) from the dividend, add it to 9, then carry on: 99 / 12

Moving on to step 4:
The number 12 fits into 99 8 times, leaving a remainder of 3.
The number 8 becomes the next digit in our result. 
Result so far: 238.0
The remainder is 3 after subtracting 96 from 99.
Bring next digit (3) of the dividend behind the 3 and repeat the process: 33 / 12

Step 5:
The number 12 fits into 33 2 times, leaving a remainder of 9.
Put 2 as the next digit of the answer. 
Result so far: 2382.0
If we take 24 away from 33, we end up with 9.
Bring next digit (9) of the dividend behind the 9 and repeat the process: 99 / 12

Going ahead to step 6:
99 divided by 12 is 8 with a remainder of 3.
The next digit of our result is 8. 
Result so far: 23828.0
Subtract 96 from 99 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 7:
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: 23828.2
Subtracting 24 from 30 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 8:
12 goes into 60 5 times with a remainder of 0.
The next digit of our result is 5. 
Result so far: 23828.25
Subtract 60 from 60 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 9:
When dividing 0 by 12, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 23828.25
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 10:
If we divide 0 by 12, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 23828.25
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 23828.25 with a remainder of 0.0.