66421730 ÷ 455 
We're looking to find how many times 455 goes into 66421730.

On to step 1:
If we divide 6 by 455, we get 0 and a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 455

Let's proceed to step 2:
When dividing 66 by 455, we get 0 with a remainder of 66.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 66 and we're left with 66.
Bring next digit (4) of the dividend behind the 66 and repeat the process: 664 / 455

Advancing to step 3:
664 divided by 455 is 1 with a remainder of 209.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 455 from 664, we get 209.
Take the next digit (2) from the dividend and append it to 209, then repeat: 2092 / 455

Step 4:
The number 455 fits into 2092 4 times, leaving a remainder of 272.
The number 4 becomes the next digit in our result. 
Result so far: 14.0
Subtracting 1820 from 2092 leaves us with 272.
Take the next digit (1) from the dividend and append it to 272, then repeat: 2721 / 455

Let's proceed to step 5:
455 goes into 2721 5 times with a remainder of 446.
Put 5 as the next digit of the answer. 
Result so far: 145.0
Subtracting 2275 from 2721 leaves us with 446.
Include the next digit (7) from the dividend after 446, then repeat: 4467 / 455

Moving on to step 6:
When dividing 4467 by 455, we get 9 with a remainder of 372.
Put 9 as the next digit of the answer. 
Result so far: 1459.0
If we subtract 4095 from 4467, we get 372.
Append the next digit (3) from the dividend to 372 and continue with: 3723 / 455

Step 7:
The number 455 fits into 3723 8 times, leaving a remainder of 83.
The next digit of our result is 8. 
Result so far: 14598.0
Subtract 3640 from 3723 to get 83.
Include the next digit (0) from the dividend after 83, then repeat: 830 / 455

Let's proceed to step 8:
The number 455 fits into 830 1 times, leaving a remainder of 375.
Put 1 as the next digit of the answer. 
Result so far: 145981.0
If we take 455 away from 830, we end up with 375.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3750, and continue the process.

Going ahead to step 9:
If we divide 3750 by 455, we get 8 and a remainder of 110.
Put 8 as the next digit of the answer. 
Result so far: 145981.8
Deduct 3640 from 3750 and we're left with 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Let's proceed to step 10:
1100 divided by 455 is 2 with a remainder of 190.
Use 2 as the next digit of our solution. 
Result so far: 145981.82
Deduct 910 from 1100 and we're left with 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

Step 11:
455 goes into 1900 4 times with a remainder of 80.
The number 4 becomes the next digit in our result. 
Result so far: 145981.824
If we take 1820 away from 1900, we end up with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Moving on to step 12:
When dividing 800 by 455, we get 1 with a remainder of 345.
Use 1 as the next digit of our solution. 
Result so far: 145981.8241
If we take 455 away from 800, we end up with 345.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3450, and continue the process.

Step 13:
The number 455 fits into 3450 7 times, leaving a remainder of 265.
The number 7 becomes the next digit in our result. 
Result so far: 145981.82417
If we subtract 3185 from 3450, we get 265.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2650, and continue the process.

Moving on to step 14:
When dividing 2650 by 455, we get 5 with a remainder of 375.
Write down 5 as next digit of the result. 
Result so far: 145981.824175
Subtract 2275 from 2650 to get 375.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3750, and continue the process.

Going ahead to step 15:
455 goes into 3750 8 times with a remainder of 110.
Use 8 as the next digit of our solution. 
Result so far: 145981.8241758
If we take 3640 away from 3750, we end up with 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Moving on to step 16:
455 can be fit into 1100 2 times, resulting in a remainder of 190.
The next digit of our result is 2. 
Result so far: 145981.82417582
Deduct 910 from 1100 and we're left with 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

In conclusion, the division gives 145981.82417582 with a balance of 1.9e-07.