461743 ÷ 21 
The aim is to understand the frequency of 21 in 461743.

Advancing to step 1:
21 goes into 4 0 times with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Grab the next digit (6) from the dividend, add it to 4, then carry on: 46 / 21

Let's proceed to step 2:
The number 21 fits into 46 2 times, leaving a remainder of 4.
Write down 2 as next digit of the result. 
Result so far: 2.0
Deduct 42 from 46 and we're left with 4.
Fetch the next digit (1) from the dividend, attach it to 4 and continue: 41 / 21

Advancing to step 3:
If we divide 41 by 21, we get 1 and a remainder of 20.
Write down 1 as next digit of the result. 
Result so far: 21.0
If we subtract 21 from 41, we get 20.
Take the next digit (7) from the dividend and append it to 20, then repeat: 207 / 21

Let's proceed to step 4:
21 goes into 207 9 times with a remainder of 18.
The next digit of our result is 9. 
Result so far: 219.0
If we take 189 away from 207, we end up with 18.
Bring next digit (4) of the dividend behind the 18 and repeat the process: 184 / 21

Step 5:
184 divided by 21 is 8 with a remainder of 16.
Use 8 as the next digit of our solution. 
Result so far: 2198.0
Subtracting 168 from 184 leaves us with 16.
Take the next digit (3) from the dividend and append it to 16, then repeat: 163 / 21

On to step 6:
The number 21 fits into 163 7 times, leaving a remainder of 16.
Write down 7 as next digit of the result. 
Result so far: 21987.0
If we take 147 away from 163, 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.

Let's proceed to step 7:
160 divided by 21 is 7 with a remainder of 13.
Use 7 as the next digit of our solution. 
Result so far: 21987.7
If we take 147 away from 160, we end up 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 8:
If we divide 130 by 21, we get 6 and a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 21987.76
Subtracting 126 from 130 leaves us 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.

Advancing to step 9:
21 goes into 40 1 times with a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 21987.761
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.

Step 10:
21 goes into 190 9 times with a remainder of 1.
The next digit of our result is 9. 
Result so far: 21987.7619
The remainder is 1 after subtracting 189 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 11:
21 can be fit into 10 0 times, resulting in a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 21987.7619
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 12:
100 divided by 21 is 4 with a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 21987.761904
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.

Going ahead to step 13:
When dividing 160 by 21, we get 7 with a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 21987.7619047
Subtract 147 from 160 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Step 14:
21 can be fit into 130 6 times, resulting in a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 21987.76190476
The remainder is 4 after subtracting 126 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The final outcome is 21987.76190476, with a leftover of 4e-09.