We look at the division of 450971 by 90 
We want to divide 450971 by 90.

Going ahead to step 1:
The number 90 fits into 4 0 times, leaving a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Include the next digit (5) from the dividend after 4, then repeat: 45 / 90

Moving on to step 2:
When dividing 45 by 90, we get 0 with a remainder of 45.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 45 to get 45.
Grab the next digit (0) from the dividend, add it to 45, then carry on: 450 / 90

Let's proceed to step 3:
If we divide 450 by 90, we get 5 and a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 5.0
Deduct 450 from 450 and we're left with 0.
Take the next digit (9) from the dividend and append it to 0, then repeat: 9 / 90

Going ahead to step 4:
90 goes into 9 0 times with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 50.0
Subtracting 0 from 9 leaves us with 9.
Append the next digit (7) from the dividend to 9 and continue with: 97 / 90

Going ahead to step 5:
If we divide 97 by 90, we get 1 and a remainder of 7.
The next digit of our result is 1. 
Result so far: 501.0
The remainder is 7 after subtracting 90 from 97.
Fetch the next digit (1) from the dividend, attach it to 7 and continue: 71 / 90

Advancing to step 6:
71 divided by 90 is 0 with a remainder of 71.
Use 0 as the next digit of our solution. 
Result so far: 5010.0
Deduct 0 from 71 and we're left with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Going ahead to step 7:
When dividing 710 by 90, we get 7 with a remainder of 80.
Put 7 as the next digit of the answer. 
Result so far: 5010.7
Deduct 630 from 710 and we're left 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.

Advancing to step 8:
90 goes into 800 8 times with a remainder of 80.
Put 8 as the next digit of the answer. 
Result so far: 5010.78
Deduct 720 from 800 and we're left 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.

Step 9:
90 goes into 800 8 times with a remainder of 80.
Record the quotient 8 as the next digit in the result. 
Result so far: 5010.788
If we take 720 away from 800, 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.

The final result is 5010.788 with a remainder of 0.008.