We divide 505459 by 21
We're looking to find how many times 21 goes into 505459.

Moving on to step 1:
If we divide 5 by 21, we get 0 and a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Take the next digit (0) from the dividend and append it to 5, then repeat: 50 / 21

Going ahead to step 2:
21 goes into 50 2 times with a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we take 42 away from 50, we end up with 8.
Fetch the next digit (5) from the dividend, attach it to 8 and continue: 85 / 21

Going ahead to step 3:
The number 21 fits into 85 4 times, leaving a remainder of 1.
Write down 4 as next digit of the result. 
Result so far: 24.0
Subtracting 84 from 85 leaves us with 1.
Fetch the next digit (4) from the dividend, attach it to 1 and continue: 14 / 21

On to step 4:
When dividing 14 by 21, we get 0 with a remainder of 14.
Write down 0 as next digit of the result. 
Result so far: 240.0
The remainder is 14 after subtracting 0 from 14.
Grab the next digit (5) from the dividend, add it to 14, then carry on: 145 / 21

Step 5:
If we divide 145 by 21, we get 6 and a remainder of 19.
The number 6 becomes the next digit in our result. 
Result so far: 2406.0
If we take 126 away from 145, we end up with 19.
Fetch the next digit (9) from the dividend, attach it to 19 and continue: 199 / 21

Advancing to step 6:
The number 21 fits into 199 9 times, leaving a remainder of 10.
Put 9 as the next digit of the answer. 
Result so far: 24069.0
Subtracting 189 from 199 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 7:
If we divide 100 by 21, we get 4 and a remainder of 16.
Write down 4 as next digit of the result. 
Result so far: 24069.4
The remainder is 16 after subtracting 84 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 8:
21 can be fit into 160 7 times, resulting in a remainder of 13.
Use 7 as the next digit of our solution. 
Result so far: 24069.47
The remainder is 13 after subtracting 147 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Going ahead to step 9:
If we divide 130 by 21, we get 6 and a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 24069.476
Subtract 126 from 130 to 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 can be fit into 40 1 times, resulting in a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 24069.4761
If we subtract 21 from 40, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Advancing to step 11:
When dividing 190 by 21, we get 9 with a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 24069.47619
Deduct 189 from 190 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 12:
When dividing 10 by 21, we get 0 with a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 24069.47619
Subtracting 0 from 10 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 13:
The number 21 fits into 100 4 times, leaving a remainder of 16.
Use 4 as the next digit of our solution. 
Result so far: 24069.4761904
If we subtract 84 from 100, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 14:
21 goes into 160 7 times with a remainder of 13.
The next digit of our result is 7. 
Result so far: 24069.47619047
Deduct 147 from 160 and we're left 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.

The quotient of the division is 24069.47619047, and the remainder is 1.3e-08.