We divide 494075 by 21
The aim is to understand the frequency of 21 in 494075.

Step 1:
The number 21 fits into 4 0 times, leaving a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Grab the next digit (9) from the dividend, add it to 4, then carry on: 49 / 21

Going ahead to step 2:
The number 21 fits into 49 2 times, leaving a remainder of 7.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we take 42 away from 49, we end up with 7.
Fetch the next digit (4) from the dividend, attach it to 7 and continue: 74 / 21

Going ahead to step 3:
74 divided by 21 is 3 with a remainder of 11.
Write down 3 as next digit of the result. 
Result so far: 23.0
Deduct 63 from 74 and we're left with 11.
Take the next digit (0) from the dividend and append it to 11, then repeat: 110 / 21

Advancing to step 4:
The number 21 fits into 110 5 times, leaving a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 235.0
If we subtract 105 from 110, we get 5.
Take the next digit (7) from the dividend and append it to 5, then repeat: 57 / 21

Going ahead to step 5:
21 goes into 57 2 times with a remainder of 15.
Use 2 as the next digit of our solution. 
Result so far: 2352.0
The remainder is 15 after subtracting 42 from 57.
Append the next digit (5) from the dividend to 15 and continue with: 155 / 21

Going ahead to step 6:
The number 21 fits into 155 7 times, leaving a remainder of 8.
Use 7 as the next digit of our solution. 
Result so far: 23527.0
Subtract 147 from 155 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 7:
80 divided by 21 is 3 with a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 23527.3
Subtract 63 from 80 to get 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 8:
170 divided by 21 is 8 with a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 23527.38
If we take 168 away from 170, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 9:
21 goes into 20 0 times with a remainder of 20.
The next digit of our result is 0. 
Result so far: 23527.38
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 10:
21 goes into 200 9 times with a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 23527.3809
Deduct 189 from 200 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 11:
21 can be fit into 110 5 times, resulting in a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 23527.38095
Deduct 105 from 110 and we're left 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.

Let's proceed to step 12:
50 divided by 21 is 2 with a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 23527.380952
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.

On to step 13:
80 divided by 21 is 3 with a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 23527.3809523
If we take 63 away from 80, we end up 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.

Going ahead to step 14:
If we divide 170 by 21, we get 8 and a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 23527.38095238
Subtracting 168 from 170 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

After the division, we end up with 23527.38095238 and a remainder of 2e-09.