193148 divided by 21 
The aim is to understand the frequency of 21 in 193148.

Going ahead to step 1:
When dividing 1 by 21, we get 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Append the next digit (9) from the dividend to 1 and continue with: 19 / 21

On to step 2:
When dividing 19 by 21, we get 0 with a remainder of 19.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 19 leaves us with 19.
Grab the next digit (3) from the dividend, add it to 19, then carry on: 193 / 21

Advancing to step 3:
When dividing 193 by 21, we get 9 with a remainder of 4.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
If we take 189 away from 193, we end up with 4.
Fetch the next digit (1) from the dividend, attach it to 4 and continue: 41 / 21

On to step 4:
The number 21 fits into 41 1 times, leaving a remainder of 20.
Record the quotient 1 as the next digit in the result. 
Result so far: 91.0
Deduct 21 from 41 and we're left with 20.
Grab the next digit (4) from the dividend, add it to 20, then carry on: 204 / 21

Advancing to step 5:
21 goes into 204 9 times with a remainder of 15.
The next digit of our result is 9. 
Result so far: 919.0
If we take 189 away from 204, we end up with 15.
Append the next digit (8) from the dividend to 15 and continue with: 158 / 21

Step 6:
21 goes into 158 7 times with a remainder of 11.
Write down 7 as next digit of the result. 
Result so far: 9197.0
If we take 147 away from 158, 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 7:
If we divide 110 by 21, we get 5 and a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 9197.5
Deduct 105 from 110 and we're left 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 8:
The number 21 fits into 50 2 times, leaving a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 9197.52
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.

Advancing to step 9:
21 goes into 80 3 times with a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 9197.523
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 10:
If we divide 170 by 21, we get 8 and a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 9197.5238
If we take 168 away from 170, we end up 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.

Advancing to step 11:
When dividing 20 by 21, we get 0 with a remainder of 20.
The next digit of our result is 0. 
Result so far: 9197.5238
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 12:
200 divided by 21 is 9 with a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 9197.523809
If we subtract 189 from 200, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 13:
When dividing 110 by 21, we get 5 with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 9197.5238095
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 14:
The number 21 fits into 50 2 times, leaving a remainder of 8.
The next digit of our result is 2. 
Result so far: 9197.52380952
Subtract 42 from 50 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Our division results in 9197.52380952 with a remaining 8e-09.