We look at the division of 45021 by 4 
We're looking to find how many times 4 goes into 45021.

Let's proceed to step 1:
4 can be fit into 4 1 times, resulting in a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 4 from 4, we get 0.
Take the next digit (5) from the dividend and append it to 0, then repeat: 5 / 4

Going ahead to step 2:
4 can be fit into 5 1 times, resulting in a remainder of 1.
Put 1 as the next digit of the answer. 
Result so far: 11.0
Subtracting 4 from 5 leaves us with 1.
Grab the next digit (0) from the dividend, add it to 1, then carry on: 10 / 4

Advancing to step 3:
4 can be fit into 10 2 times, resulting in a remainder of 2.
Write down 2 as next digit of the result. 
Result so far: 112.0
If we take 8 away from 10, we end up with 2.
Grab the next digit (2) from the dividend, add it to 2, then carry on: 22 / 4

On to step 4:
When dividing 22 by 4, we get 5 with a remainder of 2.
The next digit of our result is 5. 
Result so far: 1125.0
If we subtract 20 from 22, we get 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 4

Going ahead to step 5:
4 can be fit into 21 5 times, resulting in a remainder of 1.
Use 5 as the next digit of our solution. 
Result so far: 11255.0
If we subtract 20 from 21, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 6:
10 divided by 4 is 2 with a remainder of 2.
Record the quotient 2 as the next digit in the result. 
Result so far: 11255.2
Subtract 8 from 10 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 7:
When dividing 20 by 4, we get 5 with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 11255.25
Deduct 20 from 20 and we're left 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.

Step 8:
0 divided by 4 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 11255.25
If we subtract 0 from 0, we 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.

Moving on to step 9:
If we divide 0 by 4, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 11255.25
Subtract 0 from 0 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.

The final result is 11255.25 with a remainder of 0.0.