We're dividing 499217 by 21 
We want to figure out the number of times 499217 can be divided by 21.

On to step 1:
If we divide 4 by 21, we get 0 and a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Append the next digit (9) from the dividend to 4 and continue with: 49 / 21

Moving on to step 2:
49 divided by 21 is 2 with a remainder of 7.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we subtract 42 from 49, we get 7.
Include the next digit (9) from the dividend after 7, then repeat: 79 / 21

Step 3:
The number 21 fits into 79 3 times, leaving a remainder of 16.
The next digit of our result is 3. 
Result so far: 23.0
The remainder is 16 after subtracting 63 from 79.
Append the next digit (2) from the dividend to 16 and continue with: 162 / 21

Step 4:
21 goes into 162 7 times with a remainder of 15.
Record the quotient 7 as the next digit in the result. 
Result so far: 237.0
Subtracting 147 from 162 leaves us with 15.
Bring next digit (1) of the dividend behind the 15 and repeat the process: 151 / 21

Moving on to step 5:
151 divided by 21 is 7 with a remainder of 4.
Write down 7 as next digit of the result. 
Result so far: 2377.0
Subtracting 147 from 151 leaves us with 4.
Append the next digit (7) from the dividend to 4 and continue with: 47 / 21

Advancing to step 6:
The number 21 fits into 47 2 times, leaving a remainder of 5.
The next digit of our result is 2. 
Result so far: 23772.0
Subtracting 42 from 47 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 7:
If we divide 50 by 21, we get 2 and a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 23772.2
Deduct 42 from 50 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 8:
When dividing 80 by 21, we get 3 with a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 23772.23
Subtracting 63 from 80 leaves us with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 9:
If we divide 170 by 21, we get 8 and a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 23772.238
Subtract 168 from 170 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.

Advancing to step 10:
21 goes into 20 0 times with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 23772.238
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 11:
200 divided by 21 is 9 with a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 23772.23809
If we subtract 189 from 200, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 12:
21 can be fit into 110 5 times, resulting in a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 23772.238095
Subtract 105 from 110 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 13:
The number 21 fits into 50 2 times, leaving a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 23772.2380952
Subtracting 42 from 50 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 14:
When dividing 80 by 21, we get 3 with a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 23772.23809523
The remainder is 17 after subtracting 63 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Our division results in 23772.23809523 with a remaining 1.7e-08.