We look at the division of 93969 by 21 
The aim is to understand the frequency of 21 in 93969.

Step 1:
21 goes into 9 0 times with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Grab the next digit (3) from the dividend, add it to 9, then carry on: 93 / 21

Going ahead to step 2:
93 divided by 21 is 4 with a remainder of 9.
Use 4 as the next digit of our solution. 
Result so far: 4.0
If we take 84 away from 93, we end up with 9.
Include the next digit (9) from the dividend after 9, then repeat: 99 / 21

Going ahead to step 3:
If we divide 99 by 21, we get 4 and a remainder of 15.
Use 4 as the next digit of our solution. 
Result so far: 44.0
Subtract 84 from 99 to get 15.
Bring next digit (6) of the dividend behind the 15 and repeat the process: 156 / 21

Moving on to step 4:
21 goes into 156 7 times with a remainder of 9.
The number 7 becomes the next digit in our result. 
Result so far: 447.0
Deduct 147 from 156 and we're left with 9.
Fetch the next digit (9) from the dividend, attach it to 9 and continue: 99 / 21

Let's proceed to step 5:
21 can be fit into 99 4 times, resulting in a remainder of 15.
Write down 4 as next digit of the result. 
Result so far: 4474.0
The remainder is 15 after subtracting 84 from 99.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 6:
21 can be fit into 150 7 times, resulting in a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 4474.7
Subtract 147 from 150 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 7:
The number 21 fits into 30 1 times, leaving a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 4474.71
Deduct 21 from 30 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 8:
21 goes into 90 4 times with a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 4474.714
If we take 84 away from 90, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 9:
21 goes into 60 2 times with a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 4474.7142
If we take 42 away from 60, we end up 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.

Moving on to step 10:
The number 21 fits into 180 8 times, leaving a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 4474.71428
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.

Advancing to step 11:
120 divided by 21 is 5 with a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 4474.714285
Subtract 105 from 120 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 12:
The number 21 fits into 150 7 times, leaving a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 4474.7142857
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.

Going ahead to step 13:
30 divided by 21 is 1 with a remainder of 9.
The next digit of our result is 1. 
Result so far: 4474.71428571
The remainder is 9 after subtracting 21 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

After the division, we end up with 4474.71428571 and a remainder of 9e-09.