Let's divide 455689 by 21
Our goal is to divide 455689 by 21.

Let's proceed to step 1:
21 goes into 4 0 times with 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.
Fetch the next digit (5) from the dividend, attach it to 4 and continue: 45 / 21

Let's proceed to step 2:
If we divide 45 by 21, we get 2 and a remainder of 3.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Deduct 42 from 45 and we're left with 3.
Take the next digit (5) from the dividend and append it to 3, then repeat: 35 / 21

Going ahead to step 3:
If we divide 35 by 21, we get 1 and a remainder of 14.
The next digit of our result is 1. 
Result so far: 21.0
Deduct 21 from 35 and we're left with 14.
Bring next digit (6) of the dividend behind the 14 and repeat the process: 146 / 21

Let's proceed to step 4:
When dividing 146 by 21, we get 6 with a remainder of 20.
Write down 6 as next digit of the result. 
Result so far: 216.0
If we take 126 away from 146, we end up with 20.
Take the next digit (8) from the dividend and append it to 20, then repeat: 208 / 21

Moving on to step 5:
208 divided by 21 is 9 with a remainder of 19.
The number 9 becomes the next digit in our result. 
Result so far: 2169.0
If we take 189 away from 208, we end up with 19.
Bring next digit (9) of the dividend behind the 19 and repeat the process: 199 / 21

Step 6:
21 can be fit into 199 9 times, resulting in a remainder of 10.
Record the quotient 9 as the next digit in the result. 
Result so far: 21699.0
The remainder is 10 after subtracting 189 from 199.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 7:
21 goes into 100 4 times with a remainder of 16.
Put 4 as the next digit of the answer. 
Result so far: 21699.4
If we take 84 away from 100, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 8:
If we divide 160 by 21, we get 7 and a remainder of 13.
Use 7 as the next digit of our solution. 
Result so far: 21699.47
If we take 147 away from 160, we end up with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Advancing to step 9:
21 goes into 130 6 times with a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 21699.476
If we subtract 126 from 130, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 10:
21 goes into 40 1 times with a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 21699.4761
The remainder is 19 after subtracting 21 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 11:
21 goes into 190 9 times with a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 21699.47619
Subtract 189 from 190 to 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.

Moving on to step 12:
10 divided by 21 is 0 with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 21699.47619
If we subtract 0 from 10, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 13:
21 goes into 100 4 times with a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 21699.4761904
Deduct 84 from 100 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 14:
160 divided by 21 is 7 with a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 21699.47619047
Subtract 147 from 160 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Our division results in 21699.47619047 with a remaining 1.3e-08.