66886404 ÷ 643 
Let's see how many times 643 fits into 66886404.

Going ahead to step 1:
643 goes into 6 0 times with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 643

On to step 2:
66 divided by 643 is 0 with a remainder of 66.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 66 to get 66.
Bring next digit (8) of the dividend behind the 66 and repeat the process: 668 / 643

Advancing to step 3:
If we divide 668 by 643, we get 1 and a remainder of 25.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 25 after subtracting 643 from 668.
Fetch the next digit (8) from the dividend, attach it to 25 and continue: 258 / 643

Moving on to step 4:
643 goes into 258 0 times with a remainder of 258.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
Subtracting 0 from 258 leaves us with 258.
Bring next digit (6) of the dividend behind the 258 and repeat the process: 2586 / 643

Let's proceed to step 5:
643 goes into 2586 4 times with a remainder of 14.
Put 4 as the next digit of the answer. 
Result so far: 104.0
The remainder is 14 after subtracting 2572 from 2586.
Fetch the next digit (4) from the dividend, attach it to 14 and continue: 144 / 643

Going ahead to step 6:
The number 643 fits into 144 0 times, leaving a remainder of 144.
The next digit of our result is 0. 
Result so far: 1040.0
If we take 0 away from 144, we end up with 144.
Append the next digit (0) from the dividend to 144 and continue with: 1440 / 643

Step 7:
643 can be fit into 1440 2 times, resulting in a remainder of 154.
The number 2 becomes the next digit in our result. 
Result so far: 10402.0
Subtract 1286 from 1440 to get 154.
Bring next digit (4) of the dividend behind the 154 and repeat the process: 1544 / 643

On to step 8:
If we divide 1544 by 643, we get 2 and a remainder of 258.
The next digit of our result is 2. 
Result so far: 104022.0
If we take 1286 away from 1544, we end up with 258.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2580, and continue the process.

Going ahead to step 9:
The number 643 fits into 2580 4 times, leaving a remainder of 8.
The next digit of our result is 4. 
Result so far: 104022.4
Subtract 2572 from 2580 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 10:
643 can be fit into 80 0 times, resulting in a remainder of 80.
The number 0 becomes the next digit in our result. 
Result so far: 104022.4
The remainder is 80 after subtracting 0 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Let's proceed to step 11:
800 divided by 643 is 1 with a remainder of 157.
Use 1 as the next digit of our solution. 
Result so far: 104022.401
If we take 643 away from 800, we end up with 157.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1570, and continue the process.

Going ahead to step 12:
1570 divided by 643 is 2 with a remainder of 284.
Write down 2 as next digit of the result. 
Result so far: 104022.4012
Subtracting 1286 from 1570 leaves us with 284.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2840, and continue the process.

Moving on to step 13:
643 can be fit into 2840 4 times, resulting in a remainder of 268.
Put 4 as the next digit of the answer. 
Result so far: 104022.40124
Subtract 2572 from 2840 to get 268.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2680, and continue the process.

Moving on to step 14:
The number 643 fits into 2680 4 times, leaving a remainder of 108.
The number 4 becomes the next digit in our result. 
Result so far: 104022.401244
If we subtract 2572 from 2680, we get 108.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

After the division, we end up with 104022.401244 and a remainder of 1.08e-05.