6866255 divided by 643 
Our goal is to divide 6866255 by 643.

Going ahead to step 1:
643 can be fit into 6 0 times, resulting in a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Take the next digit (8) from the dividend and append it to 6, then repeat: 68 / 643

On to step 2:
When dividing 68 by 643, we get 0 with a remainder of 68.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 68 to get 68.
Bring next digit (6) of the dividend behind the 68 and repeat the process: 686 / 643

Advancing to step 3:
If we divide 686 by 643, we get 1 and a remainder of 43.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 643 away from 686, we end up with 43.
Grab the next digit (6) from the dividend, add it to 43, then carry on: 436 / 643

Going ahead to step 4:
When dividing 436 by 643, we get 0 with a remainder of 436.
Use 0 as the next digit of our solution. 
Result so far: 10.0
Subtract 0 from 436 to get 436.
Take the next digit (2) from the dividend and append it to 436, then repeat: 4362 / 643

Moving on to step 5:
4362 divided by 643 is 6 with a remainder of 504.
The number 6 becomes the next digit in our result. 
Result so far: 106.0
Subtract 3858 from 4362 to get 504.
Include the next digit (5) from the dividend after 504, then repeat: 5045 / 643

Let's proceed to step 6:
643 can be fit into 5045 7 times, resulting in a remainder of 544.
Use 7 as the next digit of our solution. 
Result so far: 1067.0
Subtract 4501 from 5045 to get 544.
Bring next digit (5) of the dividend behind the 544 and repeat the process: 5445 / 643

Going ahead to step 7:
5445 divided by 643 is 8 with a remainder of 301.
Use 8 as the next digit of our solution. 
Result so far: 10678.0
If we subtract 5144 from 5445, we get 301.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3010, and continue the process.

Step 8:
643 can be fit into 3010 4 times, resulting in a remainder of 438.
Record the quotient 4 as the next digit in the result. 
Result so far: 10678.4
Subtract 2572 from 3010 to get 438.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4380, and continue the process.

Advancing to step 9:
If we divide 4380 by 643, we get 6 and a remainder of 522.
The next digit of our result is 6. 
Result so far: 10678.46
If we take 3858 away from 4380, we end up with 522.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5220, and continue the process.

Advancing to step 10:
5220 divided by 643 is 8 with a remainder of 76.
Write down 8 as next digit of the result. 
Result so far: 10678.468
Subtract 5144 from 5220 to get 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

On to step 11:
The number 643 fits into 760 1 times, leaving a remainder of 117.
Write down 1 as next digit of the result. 
Result so far: 10678.4681
The remainder is 117 after subtracting 643 from 760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1170, and continue the process.

Step 12:
When dividing 1170 by 643, we get 1 with a remainder of 527.
Write down 1 as next digit of the result. 
Result so far: 10678.46811
If we take 643 away from 1170, we end up with 527.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5270, and continue the process.

The quotient of the division is 10678.46811, and the remainder is 0.000527.