485062 divided by 21 
The aim is to understand the frequency of 21 in 485062.

Going ahead to step 1:
21 can be fit into 4 0 times, resulting in a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Append the next digit (8) from the dividend to 4 and continue with: 48 / 21

Let's proceed to step 2:
If we divide 48 by 21, we get 2 and a remainder of 6.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we subtract 42 from 48, we get 6.
Bring next digit (5) of the dividend behind the 6 and repeat the process: 65 / 21

Moving on to step 3:
65 divided by 21 is 3 with a remainder of 2.
Put 3 as the next digit of the answer. 
Result so far: 23.0
The remainder is 2 after subtracting 63 from 65.
Append the next digit (0) from the dividend to 2 and continue with: 20 / 21

Moving on to step 4:
20 divided by 21 is 0 with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 230.0
Subtract 0 from 20 to get 20.
Take the next digit (6) from the dividend and append it to 20, then repeat: 206 / 21

Step 5:
If we divide 206 by 21, we get 9 and a remainder of 17.
The number 9 becomes the next digit in our result. 
Result so far: 2309.0
If we take 189 away from 206, we end up with 17.
Bring next digit (2) of the dividend behind the 17 and repeat the process: 172 / 21

Let's proceed to step 6:
172 divided by 21 is 8 with a remainder of 4.
The number 8 becomes the next digit in our result. 
Result so far: 23098.0
If we take 168 away from 172, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 7:
40 divided by 21 is 1 with a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 23098.1
If we take 21 away from 40, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 8:
21 goes into 190 9 times with a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 23098.19
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.

Moving on to step 9:
21 can be fit into 10 0 times, resulting in a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 23098.19
If we take 0 away from 10, we end up 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.

On to step 10:
The number 21 fits into 100 4 times, leaving a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 23098.1904
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 11:
If we divide 160 by 21, we get 7 and a remainder of 13.
The number 7 becomes the next digit in our result. 
Result so far: 23098.19047
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 12:
130 divided by 21 is 6 with a remainder of 4.
The next digit of our result is 6. 
Result so far: 23098.190476
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.

Moving on to step 13:
21 can be fit into 40 1 times, resulting in a remainder of 19.
The next digit of our result is 1. 
Result so far: 23098.1904761
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 14:
21 goes into 190 9 times with a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 23098.19047619
If we subtract 189 from 190, we 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.

The final outcome is 23098.19047619, with a leftover of 1e-09.