90172065 ÷ 452 
Our goal is to divide 90172065 by 452.

Step 1:
452 goes into 9 0 times with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Fetch the next digit (0) from the dividend, attach it to 9 and continue: 90 / 452

Moving on to step 2:
90 divided by 452 is 0 with a remainder of 90.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 90 to get 90.
Fetch the next digit (1) from the dividend, attach it to 90 and continue: 901 / 452

Let's proceed to step 3:
The number 452 fits into 901 1 times, leaving a remainder of 449.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 452 from 901 and we're left with 449.
Fetch the next digit (7) from the dividend, attach it to 449 and continue: 4497 / 452

On to step 4:
The number 452 fits into 4497 9 times, leaving a remainder of 429.
The next digit of our result is 9. 
Result so far: 19.0
Subtracting 4068 from 4497 leaves us with 429.
Grab the next digit (2) from the dividend, add it to 429, then carry on: 4292 / 452

On to step 5:
When dividing 4292 by 452, we get 9 with a remainder of 224.
Use 9 as the next digit of our solution. 
Result so far: 199.0
Subtract 4068 from 4292 to get 224.
Take the next digit (0) from the dividend and append it to 224, then repeat: 2240 / 452

Moving on to step 6:
When dividing 2240 by 452, we get 4 with a remainder of 432.
Record the quotient 4 as the next digit in the result. 
Result so far: 1994.0
The remainder is 432 after subtracting 1808 from 2240.
Include the next digit (6) from the dividend after 432, then repeat: 4326 / 452

Step 7:
The number 452 fits into 4326 9 times, leaving a remainder of 258.
Record the quotient 9 as the next digit in the result. 
Result so far: 19949.0
The remainder is 258 after subtracting 4068 from 4326.
Append the next digit (5) from the dividend to 258 and continue with: 2585 / 452

On to step 8:
2585 divided by 452 is 5 with a remainder of 325.
The number 5 becomes the next digit in our result. 
Result so far: 199495.0
If we subtract 2260 from 2585, we get 325.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3250, and continue the process.

Let's proceed to step 9:
452 can be fit into 3250 7 times, resulting in a remainder of 86.
Record the quotient 7 as the next digit in the result. 
Result so far: 199495.7
If we subtract 3164 from 3250, we get 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Advancing to step 10:
If we divide 860 by 452, we get 1 and a remainder of 408.
Record the quotient 1 as the next digit in the result. 
Result so far: 199495.71
Subtract 452 from 860 to get 408.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4080, and continue the process.

Moving on to step 11:
The number 452 fits into 4080 9 times, leaving a remainder of 12.
Write down 9 as next digit of the result. 
Result so far: 199495.719
If we take 4068 away from 4080, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 12:
120 divided by 452 is 0 with a remainder of 120.
Use 0 as the next digit of our solution. 
Result so far: 199495.719
Subtracting 0 from 120 leaves us with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Advancing to step 13:
If we divide 1200 by 452, we get 2 and a remainder of 296.
The next digit of our result is 2. 
Result so far: 199495.71902
Subtract 904 from 1200 to get 296.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2960, and continue the process.

Moving on to step 14:
The number 452 fits into 2960 6 times, leaving a remainder of 248.
Write down 6 as next digit of the result. 
Result so far: 199495.719026
The remainder is 248 after subtracting 2712 from 2960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2480, and continue the process.

Moving on to step 15:
If we divide 2480 by 452, we get 5 and a remainder of 220.
The number 5 becomes the next digit in our result. 
Result so far: 199495.7190265
Subtract 2260 from 2480 to get 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Moving on to step 16:
2200 divided by 452 is 4 with a remainder of 392.
The number 4 becomes the next digit in our result. 
Result so far: 199495.71902654
Deduct 1808 from 2200 and we're left with 392.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3920, and continue the process.

The final result is 199495.71902654 with a remainder of 3.92e-07.