We look at the division of 452787 by 21 
Let's see how many times 21 fits into 452787.

Moving on to step 1:
If we divide 4 by 21, we get 0 and a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Bring next digit (5) of the dividend behind the 4 and repeat the process: 45 / 21

On to step 2:
45 divided by 21 is 2 with a remainder of 3.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
The remainder is 3 after subtracting 42 from 45.
Include the next digit (2) from the dividend after 3, then repeat: 32 / 21

Going ahead to step 3:
32 divided by 21 is 1 with a remainder of 11.
Record the quotient 1 as the next digit in the result. 
Result so far: 21.0
If we take 21 away from 32, we end up with 11.
Append the next digit (7) from the dividend to 11 and continue with: 117 / 21

On to step 4:
21 goes into 117 5 times with a remainder of 12.
Use 5 as the next digit of our solution. 
Result so far: 215.0
If we subtract 105 from 117, we get 12.
Append the next digit (8) from the dividend to 12 and continue with: 128 / 21

Advancing to step 5:
When dividing 128 by 21, we get 6 with a remainder of 2.
Write down 6 as next digit of the result. 
Result so far: 2156.0
If we take 126 away from 128, we end up with 2.
Take the next digit (7) from the dividend and append it to 2, then repeat: 27 / 21

Step 6:
When dividing 27 by 21, we get 1 with a remainder of 6.
Use 1 as the next digit of our solution. 
Result so far: 21561.0
Subtract 21 from 27 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 7:
If we divide 60 by 21, we get 2 and a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 21561.2
Subtract 42 from 60 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 8:
180 divided by 21 is 8 with a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 21561.28
Deduct 168 from 180 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 9:
If we divide 120 by 21, we get 5 and a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 21561.285
If we take 105 away from 120, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 10:
The number 21 fits into 150 7 times, leaving a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 21561.2857
Deduct 147 from 150 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 11:
The number 21 fits into 30 1 times, leaving a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 21561.28571
Deduct 21 from 30 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 12:
If we divide 90 by 21, we get 4 and a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 21561.285714
The remainder is 6 after subtracting 84 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 13:
21 can be fit into 60 2 times, resulting in a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 21561.2857142
If we subtract 42 from 60, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Advancing to step 14:
When dividing 180 by 21, we get 8 with a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 21561.28571428
Deduct 168 from 180 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The final outcome is 21561.28571428, with a leftover of 1.2e-08.