We're dividing 195129 by 21 
The aim is to understand the frequency of 21 in 195129.

Advancing to step 1:
21 goes into 1 0 times with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Include the next digit (9) from the dividend after 1, then repeat: 19 / 21

Step 2:
19 divided by 21 is 0 with a remainder of 19.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 19 to get 19.
Append the next digit (5) from the dividend to 19 and continue with: 195 / 21

Moving on to step 3:
If we divide 195 by 21, we get 9 and a remainder of 6.
Use 9 as the next digit of our solution. 
Result so far: 9.0
Subtracting 189 from 195 leaves us with 6.
Take the next digit (1) from the dividend and append it to 6, then repeat: 61 / 21

Moving on to step 4:
21 goes into 61 2 times with a remainder of 19.
Put 2 as the next digit of the answer. 
Result so far: 92.0
If we take 42 away from 61, we end up with 19.
Include the next digit (2) from the dividend after 19, then repeat: 192 / 21

Advancing to step 5:
The number 21 fits into 192 9 times, leaving a remainder of 3.
The next digit of our result is 9. 
Result so far: 929.0
Subtract 189 from 192 to get 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 21

Moving on to step 6:
When dividing 39 by 21, we get 1 with a remainder of 18.
Put 1 as the next digit of the answer. 
Result so far: 9291.0
The remainder is 18 after subtracting 21 from 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 7:
21 goes into 180 8 times with a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 9291.8
Subtracting 168 from 180 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 8:
If we divide 120 by 21, we get 5 and a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 9291.85
If we take 105 away from 120, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 9:
21 goes into 150 7 times with a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 9291.857
Deduct 147 from 150 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 10:
30 divided by 21 is 1 with a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 9291.8571
If we subtract 21 from 30, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 11:
If we divide 90 by 21, we get 4 and a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 9291.85714
Subtract 84 from 90 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 12:
If we divide 60 by 21, we get 2 and a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 9291.857142
Subtracting 42 from 60 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 13:
21 can be fit into 180 8 times, resulting in a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 9291.8571428
Deduct 168 from 180 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 14:
120 divided by 21 is 5 with a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 9291.85714285
If we take 105 away from 120, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

The quotient of the division is 9291.85714285, and the remainder is 1.5e-08.