54845543 ÷ 666 
Let's see how many times 666 fits into 54845543.

Advancing to step 1:
When dividing 5 by 666, we get 0 with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Grab the next digit (4) from the dividend, add it to 5, then carry on: 54 / 666

Advancing to step 2:
When dividing 54 by 666, we get 0 with a remainder of 54.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 54 leaves us with 54.
Fetch the next digit (8) from the dividend, attach it to 54 and continue: 548 / 666

Advancing to step 3:
666 goes into 548 0 times with a remainder of 548.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 548, we end up with 548.
Fetch the next digit (4) from the dividend, attach it to 548 and continue: 5484 / 666

Step 4:
When dividing 5484 by 666, we get 8 with a remainder of 156.
Put 8 as the next digit of the answer. 
Result so far: 8.0
Deduct 5328 from 5484 and we're left with 156.
Grab the next digit (5) from the dividend, add it to 156, then carry on: 1565 / 666

Moving on to step 5:
The number 666 fits into 1565 2 times, leaving a remainder of 233.
Put 2 as the next digit of the answer. 
Result so far: 82.0
The remainder is 233 after subtracting 1332 from 1565.
Bring next digit (5) of the dividend behind the 233 and repeat the process: 2335 / 666

Let's proceed to step 6:
If we divide 2335 by 666, we get 3 and a remainder of 337.
The next digit of our result is 3. 
Result so far: 823.0
If we take 1998 away from 2335, we end up with 337.
Include the next digit (4) from the dividend after 337, then repeat: 3374 / 666

Advancing to step 7:
If we divide 3374 by 666, we get 5 and a remainder of 44.
The next digit of our result is 5. 
Result so far: 8235.0
Subtract 3330 from 3374 to get 44.
Append the next digit (3) from the dividend to 44 and continue with: 443 / 666

Step 8:
666 goes into 443 0 times with a remainder of 443.
Use 0 as the next digit of our solution. 
Result so far: 82350.0
If we take 0 away from 443, we end up with 443.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4430, and continue the process.

Moving on to step 9:
When dividing 4430 by 666, we get 6 with a remainder of 434.
Write down 6 as next digit of the result. 
Result so far: 82350.6
Subtract 3996 from 4430 to get 434.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4340, and continue the process.

Advancing to step 10:
If we divide 4340 by 666, we get 6 and a remainder of 344.
Write down 6 as next digit of the result. 
Result so far: 82350.66
Deduct 3996 from 4340 and we're left with 344.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3440, and continue the process.

Our division results in 82350.66 with a remaining 0.344.