643824 ÷ 12 
Let's see how many times 12 fits into 643824.

Let's proceed to step 1:
6 divided by 12 is 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 12

Let's proceed to step 2:
12 goes into 64 5 times with a remainder of 4.
Put 5 as the next digit of the answer. 
Result so far: 5.0
Subtract 60 from 64 to get 4.
Include the next digit (3) from the dividend after 4, then repeat: 43 / 12

Moving on to step 3:
When dividing 43 by 12, we get 3 with a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 53.0
If we take 36 away from 43, we end up with 7.
Grab the next digit (8) from the dividend, add it to 7, then carry on: 78 / 12

Let's proceed to step 4:
12 goes into 78 6 times with a remainder of 6.
The next digit of our result is 6. 
Result so far: 536.0
If we take 72 away from 78, we end up with 6.
Append the next digit (2) from the dividend to 6 and continue with: 62 / 12

On to step 5:
When dividing 62 by 12, we get 5 with a remainder of 2.
Record the quotient 5 as the next digit in the result. 
Result so far: 5365.0
If we take 60 away from 62, we end up with 2.
Bring next digit (4) of the dividend behind the 2 and repeat the process: 24 / 12

Moving on to step 6:
When dividing 24 by 12, we get 2 with a remainder of 0.
Use 2 as the next digit of our solution. 
Result so far: 53652.0
The remainder is 0 after subtracting 24 from 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 7:
If we divide 0 by 12, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 53652.0
Subtract 0 from 0 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.

On to step 8:
The number 12 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 53652.0
The remainder is 0 after subtracting 0 from 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 53652.0 with a remainder of 0.0.