643392 ÷ 82 
We're looking to find how many times 82 goes into 643392.

Let's proceed to step 1:
82 goes into 6 0 times with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 82

Advancing to step 2:
If we divide 64 by 82, we get 0 and a remainder of 64.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 64 leaves us with 64.
Fetch the next digit (3) from the dividend, attach it to 64 and continue: 643 / 82

Moving on to step 3:
643 divided by 82 is 7 with a remainder of 69.
Use 7 as the next digit of our solution. 
Result so far: 7.0
Subtract 574 from 643 to get 69.
Append the next digit (3) from the dividend to 69 and continue with: 693 / 82

Going ahead to step 4:
The number 82 fits into 693 8 times, leaving a remainder of 37.
The next digit of our result is 8. 
Result so far: 78.0
Subtracting 656 from 693 leaves us with 37.
Fetch the next digit (9) from the dividend, attach it to 37 and continue: 379 / 82

On to step 5:
When dividing 379 by 82, we get 4 with a remainder of 51.
The number 4 becomes the next digit in our result. 
Result so far: 784.0
Subtract 328 from 379 to get 51.
Bring next digit (2) of the dividend behind the 51 and repeat the process: 512 / 82

On to step 6:
The number 82 fits into 512 6 times, leaving a remainder of 20.
Use 6 as the next digit of our solution. 
Result so far: 7846.0
Subtract 492 from 512 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 7:
When dividing 200 by 82, we get 2 with a remainder of 36.
The number 2 becomes the next digit in our result. 
Result so far: 7846.2
Subtract 164 from 200 to get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Step 8:
82 goes into 360 4 times with a remainder of 32.
Use 4 as the next digit of our solution. 
Result so far: 7846.24
Deduct 328 from 360 and we're left with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Going ahead to step 9:
When dividing 320 by 82, we get 3 with a remainder of 74.
The next digit of our result is 3. 
Result so far: 7846.243
If we take 246 away from 320, we end up with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Advancing to step 10:
If we divide 740 by 82, we get 9 and a remainder of 2.
Put 9 as the next digit of the answer. 
Result so far: 7846.2439
Deduct 738 from 740 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 11:
82 can be fit into 20 0 times, resulting in a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 7846.2439
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 12:
When dividing 200 by 82, we get 2 with a remainder of 36.
The number 2 becomes the next digit in our result. 
Result so far: 7846.243902
Subtract 164 from 200 to get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Let's proceed to step 13:
When dividing 360 by 82, we get 4 with a remainder of 32.
Put 4 as the next digit of the answer. 
Result so far: 7846.2439024
The remainder is 32 after subtracting 328 from 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Moving on to step 14:
82 can be fit into 320 3 times, resulting in a remainder of 74.
Record the quotient 3 as the next digit in the result. 
Result so far: 7846.24390243
If we subtract 246 from 320, we get 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

The final outcome is 7846.24390243, with a leftover of 7.4e-08.