We look at the division of 81972391 by 450 
We want to divide 81972391 by 450.

Advancing to step 1:
8 divided by 450 is 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 450

Let's proceed to step 2:
If we divide 81 by 450, we get 0 and a remainder of 81.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 81 leaves us with 81.
Take the next digit (9) from the dividend and append it to 81, then repeat: 819 / 450

Let's proceed to step 3:
When dividing 819 by 450, we get 1 with a remainder of 369.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 369 after subtracting 450 from 819.
Take the next digit (7) from the dividend and append it to 369, then repeat: 3697 / 450

Advancing to step 4:
450 can be fit into 3697 8 times, resulting in a remainder of 97.
Record the quotient 8 as the next digit in the result. 
Result so far: 18.0
The remainder is 97 after subtracting 3600 from 3697.
Include the next digit (2) from the dividend after 97, then repeat: 972 / 450

Advancing to step 5:
972 divided by 450 is 2 with a remainder of 72.
Put 2 as the next digit of the answer. 
Result so far: 182.0
If we take 900 away from 972, we end up with 72.
Fetch the next digit (3) from the dividend, attach it to 72 and continue: 723 / 450

Let's proceed to step 6:
When dividing 723 by 450, we get 1 with a remainder of 273.
Put 1 as the next digit of the answer. 
Result so far: 1821.0
If we subtract 450 from 723, we get 273.
Grab the next digit (9) from the dividend, add it to 273, then carry on: 2739 / 450

Let's proceed to step 7:
When dividing 2739 by 450, we get 6 with a remainder of 39.
The number 6 becomes the next digit in our result. 
Result so far: 18216.0
Subtracting 2700 from 2739 leaves us with 39.
Take the next digit (1) from the dividend and append it to 39, then repeat: 391 / 450

Advancing to step 8:
The number 450 fits into 391 0 times, leaving a remainder of 391.
Use 0 as the next digit of our solution. 
Result so far: 182160.0
The remainder is 391 after subtracting 0 from 391.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3910, and continue the process.

On to step 9:
If we divide 3910 by 450, we get 8 and a remainder of 310.
The number 8 becomes the next digit in our result. 
Result so far: 182160.8
The remainder is 310 after subtracting 3600 from 3910.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

Moving on to step 10:
450 can be fit into 3100 6 times, resulting in a remainder of 400.
The number 6 becomes the next digit in our result. 
Result so far: 182160.86
If we take 2700 away from 3100, we end up with 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Advancing to step 11:
4000 divided by 450 is 8 with a remainder of 400.
Write down 8 as next digit of the result. 
Result so far: 182160.868
Deduct 3600 from 4000 and we're left with 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Going ahead to step 12:
450 can be fit into 4000 8 times, resulting in a remainder of 400.
Put 8 as the next digit of the answer. 
Result so far: 182160.8688
The remainder is 400 after subtracting 3600 from 4000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

The final outcome is 182160.8688, with a leftover of 0.004.