We divide 450171 by 90
Our goal is to divide 450171 by 90.

Going ahead to step 1:
90 can be fit into 4 0 times, resulting in a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Take the next digit (5) from the dividend and append it to 4, then repeat: 45 / 90

Advancing to step 2:
The number 90 fits into 45 0 times, leaving a remainder of 45.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 45, we get 45.
Bring next digit (0) of the dividend behind the 45 and repeat the process: 450 / 90

Going ahead to step 3:
90 can be fit into 450 5 times, resulting in a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 5.0
Subtracting 450 from 450 leaves us with 0.
Take the next digit (1) from the dividend and append it to 0, then repeat: 1 / 90

Step 4:
1 divided by 90 is 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 50.0
If we subtract 0 from 1, we get 1.
Bring next digit (7) of the dividend behind the 1 and repeat the process: 17 / 90

Going ahead to step 5:
The number 90 fits into 17 0 times, leaving a remainder of 17.
The number 0 becomes the next digit in our result. 
Result so far: 500.0
Subtract 0 from 17 to get 17.
Take the next digit (1) from the dividend and append it to 17, then repeat: 171 / 90

Going ahead to step 6:
90 can be fit into 171 1 times, resulting in a remainder of 81.
Put 1 as the next digit of the answer. 
Result so far: 5001.0
Subtract 90 from 171 to get 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Advancing to step 7:
810 divided by 90 is 9 with a remainder of 0.
Record the quotient 9 as the next digit in the result. 
Result so far: 5001.9
Subtract 810 from 810 to 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.

Step 8:
90 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 5001.9
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 9:
If we divide 0 by 90, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 5001.9
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

In conclusion, the division gives 5001.9 with a balance of 0.0.