Let's divide 615632 by 21
The aim is to understand the frequency of 21 in 615632.

Advancing to step 1:
6 divided by 21 is 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Bring next digit (1) of the dividend behind the 6 and repeat the process: 61 / 21

On to step 2:
21 can be fit into 61 2 times, resulting in a remainder of 19.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we take 42 away from 61, we end up with 19.
Bring next digit (5) of the dividend behind the 19 and repeat the process: 195 / 21

Moving on to step 3:
21 goes into 195 9 times with a remainder of 6.
The next digit of our result is 9. 
Result so far: 29.0
If we subtract 189 from 195, we get 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 21

Step 4:
66 divided by 21 is 3 with a remainder of 3.
Write down 3 as next digit of the result. 
Result so far: 293.0
If we take 63 away from 66, we end up with 3.
Grab the next digit (3) from the dividend, add it to 3, then carry on: 33 / 21

On to step 5:
21 can be fit into 33 1 times, resulting in a remainder of 12.
Write down 1 as next digit of the result. 
Result so far: 2931.0
Deduct 21 from 33 and we're left with 12.
Fetch the next digit (2) from the dividend, attach it to 12 and continue: 122 / 21

Step 6:
If we divide 122 by 21, we get 5 and a remainder of 17.
Use 5 as the next digit of our solution. 
Result so far: 29315.0
Deduct 105 from 122 and we're left 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.

Step 7:
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: 29315.8
The remainder is 2 after subtracting 168 from 170.
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 8:
When dividing 20 by 21, we get 0 with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 29315.8
Deduct 0 from 20 and we're left 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.

Moving on to step 9:
21 goes into 200 9 times with a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 29315.809
If we take 189 away from 200, we end up 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.

Going ahead to step 10:
21 can be fit into 110 5 times, resulting in a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 29315.8095
If we take 105 away from 110, we end up 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.

On to step 11:
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: 29315.80952
The remainder is 8 after subtracting 42 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 12:
21 goes into 80 3 times with a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 29315.809523
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.

Going ahead to step 13:
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: 29315.8095238
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.

Going ahead to step 14:
21 can be fit into 20 0 times, resulting in a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 29315.8095238
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The final result is 29315.8095238 with a remainder of 2e-08.