We're dividing 450158 by 90 
We're looking to find how many times 90 goes into 450158.

Going ahead to step 1:
When dividing 4 by 90, we get 0 with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Grab the next digit (5) from the dividend, add it to 4, then carry on: 45 / 90

On to step 2:
90 goes into 45 0 times with a remainder of 45.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 45, we get 45.
Append the next digit (0) from the dividend to 45 and continue with: 450 / 90

On to step 3:
The number 90 fits into 450 5 times, leaving a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 5.0
Subtracting 450 from 450 leaves us with 0.
Fetch the next digit (1) from the dividend, attach it to 0 and continue: 1 / 90

Advancing to step 4:
The number 90 fits into 1 0 times, leaving a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 50.0
If we take 0 away from 1, we end up with 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 90

Step 5:
90 goes into 15 0 times with a remainder of 15.
Put 0 as the next digit of the answer. 
Result so far: 500.0
Deduct 0 from 15 and we're left with 15.
Append the next digit (8) from the dividend to 15 and continue with: 158 / 90

Let's proceed to step 6:
90 can be fit into 158 1 times, resulting in a remainder of 68.
The next digit of our result is 1. 
Result so far: 5001.0
The remainder is 68 after subtracting 90 from 158.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Going ahead to step 7:
90 can be fit into 680 7 times, resulting in a remainder of 50.
The next digit of our result is 7. 
Result so far: 5001.7
If we take 630 away from 680, we end up with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 8:
500 divided by 90 is 5 with a remainder of 50.
Put 5 as the next digit of the answer. 
Result so far: 5001.75
Subtracting 450 from 500 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 9:
If we divide 500 by 90, we get 5 and a remainder of 50.
Put 5 as the next digit of the answer. 
Result so far: 5001.755
Deduct 450 from 500 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

After the division, we end up with 5001.755 and a remainder of 0.005.