642853 divided by 12 
We're looking to find how many times 12 goes into 642853.

Moving on to step 1:
6 divided by 12 is 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 12

Step 2:
The number 12 fits into 64 5 times, leaving a remainder of 4.
Use 5 as the next digit of our solution. 
Result so far: 5.0
If we take 60 away from 64, we end up with 4.
Include the next digit (2) from the dividend after 4, then repeat: 42 / 12

Step 3:
When dividing 42 by 12, we get 3 with a remainder of 6.
Use 3 as the next digit of our solution. 
Result so far: 53.0
Subtract 36 from 42 to get 6.
Bring next digit (8) of the dividend behind the 6 and repeat the process: 68 / 12

Let's proceed to step 4:
68 divided by 12 is 5 with a remainder of 8.
Record the quotient 5 as the next digit in the result. 
Result so far: 535.0
If we take 60 away from 68, we end up with 8.
Bring next digit (5) of the dividend behind the 8 and repeat the process: 85 / 12

Advancing to step 5:
12 goes into 85 7 times with a remainder of 1.
Write down 7 as next digit of the result. 
Result so far: 5357.0
Deduct 84 from 85 and we're left with 1.
Append the next digit (3) from the dividend to 1 and continue with: 13 / 12

Moving on to step 6:
12 can be fit into 13 1 times, resulting in a remainder of 1.
Write down 1 as next digit of the result. 
Result so far: 53571.0
If we subtract 12 from 13, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 7:
When dividing 10 by 12, we get 0 with a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 53571.0
Subtract 0 from 10 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 8:
12 goes into 100 8 times with a remainder of 4.
Put 8 as the next digit of the answer. 
Result so far: 53571.08
If we take 96 away from 100, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 9:
When dividing 40 by 12, we get 3 with a remainder of 4.
The next digit of our result is 3. 
Result so far: 53571.083
The remainder is 4 after subtracting 36 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 10:
40 divided by 12 is 3 with a remainder of 4.
The next digit of our result is 3. 
Result so far: 53571.0833
If we take 36 away from 40, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The final result is 53571.0833 with a remainder of 4e-05.