We look at the division of 465046 by 21 
The aim is to understand the frequency of 21 in 465046.

Going ahead to step 1:
When dividing 4 by 21, we get 0 with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Append the next digit (6) from the dividend to 4 and continue with: 46 / 21

Advancing to step 2:
21 goes into 46 2 times with a remainder of 4.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtracting 42 from 46 leaves us with 4.
Grab the next digit (5) from the dividend, add it to 4, then carry on: 45 / 21

Step 3:
When dividing 45 by 21, we get 2 with a remainder of 3.
The next digit of our result is 2. 
Result so far: 22.0
The remainder is 3 after subtracting 42 from 45.
Append the next digit (0) from the dividend to 3 and continue with: 30 / 21

Moving on to step 4:
When dividing 30 by 21, we get 1 with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 221.0
Subtracting 21 from 30 leaves us with 9.
Bring next digit (4) of the dividend behind the 9 and repeat the process: 94 / 21

Let's proceed to step 5:
21 goes into 94 4 times with a remainder of 10.
The number 4 becomes the next digit in our result. 
Result so far: 2214.0
Deduct 84 from 94 and we're left with 10.
Grab the next digit (6) from the dividend, add it to 10, then carry on: 106 / 21

Moving on to step 6:
21 can be fit into 106 5 times, resulting in a remainder of 1.
Write down 5 as next digit of the result. 
Result so far: 22145.0
Deduct 105 from 106 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 7:
21 can be fit into 10 0 times, resulting in a remainder of 10.
The next digit of our result is 0. 
Result so far: 22145.0
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 8:
When dividing 100 by 21, we get 4 with a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 22145.04
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.

Let's proceed to step 9:
The number 21 fits into 160 7 times, leaving a remainder of 13.
Record the quotient 7 as the next digit in the result. 
Result so far: 22145.047
Subtracting 147 from 160 leaves us 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.

On to step 10:
130 divided by 21 is 6 with a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 22145.0476
If we take 126 away from 130, 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.

Step 11:
When dividing 40 by 21, we get 1 with a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 22145.04761
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.

Moving on to step 12:
When dividing 190 by 21, we get 9 with a remainder of 1.
The next digit of our result is 9. 
Result so far: 22145.047619
Subtracting 189 from 190 leaves us 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 13:
The number 21 fits into 10 0 times, leaving a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 22145.047619
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.

Advancing to step 14:
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: 22145.04761904
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.

After the division, we end up with 22145.04761904 and a remainder of 1.6e-08.