72709297 ÷ 455 
We want to figure out the number of times 72709297 can be divided by 455.

On to step 1:
When dividing 7 by 455, we get 0 with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Fetch the next digit (2) from the dividend, attach it to 7 and continue: 72 / 455

Let's proceed to step 2:
When dividing 72 by 455, we get 0 with a remainder of 72.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 72 and we're left with 72.
Append the next digit (7) from the dividend to 72 and continue with: 727 / 455

Moving on to step 3:
When dividing 727 by 455, we get 1 with a remainder of 272.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 455 from 727 to get 272.
Include the next digit (0) from the dividend after 272, then repeat: 2720 / 455

On to step 4:
2720 divided by 455 is 5 with a remainder of 445.
The next digit of our result is 5. 
Result so far: 15.0
Subtract 2275 from 2720 to get 445.
Bring next digit (9) of the dividend behind the 445 and repeat the process: 4459 / 455

On to step 5:
4459 divided by 455 is 9 with a remainder of 364.
The number 9 becomes the next digit in our result. 
Result so far: 159.0
Subtract 4095 from 4459 to get 364.
Take the next digit (2) from the dividend and append it to 364, then repeat: 3642 / 455

Going ahead to step 6:
455 can be fit into 3642 8 times, resulting in a remainder of 2.
The next digit of our result is 8. 
Result so far: 1598.0
Subtract 3640 from 3642 to get 2.
Take the next digit (9) from the dividend and append it to 2, then repeat: 29 / 455

Going ahead to step 7:
29 divided by 455 is 0 with a remainder of 29.
Record the quotient 0 as the next digit in the result. 
Result so far: 15980.0
If we subtract 0 from 29, we get 29.
Include the next digit (7) from the dividend after 29, then repeat: 297 / 455

Going ahead to step 8:
297 divided by 455 is 0 with a remainder of 297.
Write down 0 as next digit of the result. 
Result so far: 159800.0
If we subtract 0 from 297, we get 297.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2970, and continue the process.

Advancing to step 9:
When dividing 2970 by 455, we get 6 with a remainder of 240.
The next digit of our result is 6. 
Result so far: 159800.6
Deduct 2730 from 2970 and we're left with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Step 10:
If we divide 2400 by 455, we get 5 and a remainder of 125.
The next digit of our result is 5. 
Result so far: 159800.65
If we take 2275 away from 2400, we end up with 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

Going ahead to step 11:
The number 455 fits into 1250 2 times, leaving a remainder of 340.
Put 2 as the next digit of the answer. 
Result so far: 159800.652
If we take 910 away from 1250, we end up with 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Advancing to step 12:
3400 divided by 455 is 7 with a remainder of 215.
The next digit of our result is 7. 
Result so far: 159800.6527
Subtract 3185 from 3400 to get 215.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2150, and continue the process.

Going ahead to step 13:
455 can be fit into 2150 4 times, resulting in a remainder of 330.
The next digit of our result is 4. 
Result so far: 159800.65274
If we take 1820 away from 2150, we end up with 330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3300, and continue the process.

Step 14:
455 can be fit into 3300 7 times, resulting in a remainder of 115.
Put 7 as the next digit of the answer. 
Result so far: 159800.652747
If we subtract 3185 from 3300, we get 115.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1150, and continue the process.

Moving on to step 15:
The number 455 fits into 1150 2 times, leaving a remainder of 240.
The number 2 becomes the next digit in our result. 
Result so far: 159800.6527472
If we subtract 910 from 1150, we get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Going ahead to step 16:
455 can be fit into 2400 5 times, resulting in a remainder of 125.
Record the quotient 5 as the next digit in the result. 
Result so far: 159800.65274725
Deduct 2275 from 2400 and we're left with 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

The final outcome is 159800.65274725, with a leftover of 1.25e-07.