Let's divide 420255 by 66
We want to figure out the number of times 420255 can be divided by 66.

On to step 1:
When dividing 4 by 66, we get 0 with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Append the next digit (2) from the dividend to 4 and continue with: 42 / 66

On to step 2:
If we divide 42 by 66, we get 0 and a remainder of 42.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 42, we get 42.
Grab the next digit (0) from the dividend, add it to 42, then carry on: 420 / 66

Step 3:
When dividing 420 by 66, we get 6 with a remainder of 24.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
If we take 396 away from 420, we end up with 24.
Grab the next digit (2) from the dividend, add it to 24, then carry on: 242 / 66

Moving on to step 4:
66 can be fit into 242 3 times, resulting in a remainder of 44.
Write down 3 as next digit of the result. 
Result so far: 63.0
Deduct 198 from 242 and we're left with 44.
Grab the next digit (5) from the dividend, add it to 44, then carry on: 445 / 66

On to step 5:
The number 66 fits into 445 6 times, leaving a remainder of 49.
The next digit of our result is 6. 
Result so far: 636.0
If we take 396 away from 445, we end up with 49.
Fetch the next digit (5) from the dividend, attach it to 49 and continue: 495 / 66

Going ahead to step 6:
495 divided by 66 is 7 with a remainder of 33.
Put 7 as the next digit of the answer. 
Result so far: 6367.0
Deduct 462 from 495 and we're left with 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Moving on to step 7:
330 divided by 66 is 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 6367.5
If we subtract 330 from 330, we 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.

Let's proceed to step 8:
66 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 6367.5
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.

Advancing to step 9:
66 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 6367.5
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 quotient of the division is 6367.5, and the remainder is 0.0.