453426 ÷ 21 
We want to figure out the number of times 453426 can be divided by 21.

Moving on to step 1:
The number 21 fits into 4 0 times, leaving a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Bring next digit (5) of the dividend behind the 4 and repeat the process: 45 / 21

Step 2:
The number 21 fits into 45 2 times, leaving a remainder of 3.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we take 42 away from 45, we end up with 3.
Fetch the next digit (3) from the dividend, attach it to 3 and continue: 33 / 21

Let's proceed to step 3:
The number 21 fits into 33 1 times, leaving a remainder of 12.
The number 1 becomes the next digit in our result. 
Result so far: 21.0
Deduct 21 from 33 and we're left with 12.
Include the next digit (4) from the dividend after 12, then repeat: 124 / 21

Going ahead to step 4:
21 can be fit into 124 5 times, resulting in a remainder of 19.
Record the quotient 5 as the next digit in the result. 
Result so far: 215.0
The remainder is 19 after subtracting 105 from 124.
Append the next digit (2) from the dividend to 19 and continue with: 192 / 21

Moving on to step 5:
21 goes into 192 9 times with a remainder of 3.
Record the quotient 9 as the next digit in the result. 
Result so far: 2159.0
Subtract 189 from 192 to get 3.
Fetch the next digit (6) from the dividend, attach it to 3 and continue: 36 / 21

Advancing to step 6:
When dividing 36 by 21, we get 1 with a remainder of 15.
Record the quotient 1 as the next digit in the result. 
Result so far: 21591.0
Subtract 21 from 36 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 7:
21 can be fit into 150 7 times, resulting in a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 21591.7
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.

Let's proceed to step 8:
The number 21 fits into 30 1 times, leaving a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 21591.71
Subtracting 21 from 30 leaves us 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.

Let's proceed to step 9:
90 divided by 21 is 4 with a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 21591.714
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.

Let's proceed to step 10:
When dividing 60 by 21, we get 2 with a remainder of 18.
The next digit of our result is 2. 
Result so far: 21591.7142
The remainder is 18 after subtracting 42 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 11:
When dividing 180 by 21, we get 8 with a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 21591.71428
Subtracting 168 from 180 leaves us 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.

Moving on to step 12:
When dividing 120 by 21, we get 5 with a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 21591.714285
If we subtract 105 from 120, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 13:
21 can be fit into 150 7 times, resulting in a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 21591.7142857
Subtract 147 from 150 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 14:
30 divided by 21 is 1 with a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 21591.71428571
Subtract 21 from 30 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Our division results in 21591.71428571 with a remaining 9e-09.