We're dividing 89983 by 21 
The aim is to understand the frequency of 21 in 89983.

Going ahead to step 1:
21 goes into 8 0 times with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Append the next digit (9) from the dividend to 8 and continue with: 89 / 21

On to step 2:
The number 21 fits into 89 4 times, leaving a remainder of 5.
The next digit of our result is 4. 
Result so far: 4.0
If we take 84 away from 89, we end up with 5.
Append the next digit (9) from the dividend to 5 and continue with: 59 / 21

Let's proceed to step 3:
When dividing 59 by 21, we get 2 with a remainder of 17.
Write down 2 as next digit of the result. 
Result so far: 42.0
If we subtract 42 from 59, we get 17.
Include the next digit (8) from the dividend after 17, then repeat: 178 / 21

Step 4:
When dividing 178 by 21, we get 8 with a remainder of 10.
The number 8 becomes the next digit in our result. 
Result so far: 428.0
The remainder is 10 after subtracting 168 from 178.
Take the next digit (3) from the dividend and append it to 10, then repeat: 103 / 21

On to step 5:
21 can be fit into 103 4 times, resulting in a remainder of 19.
Write down 4 as next digit of the result. 
Result so far: 4284.0
Deduct 84 from 103 and we're left 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 6:
21 can be fit into 190 9 times, resulting in a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 4284.9
Subtract 189 from 190 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 7:
If we divide 10 by 21, we get 0 and a remainder of 10.
The next digit of our result is 0. 
Result so far: 4284.9
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.

Advancing to step 8:
When dividing 100 by 21, we get 4 with a remainder of 16.
Write down 4 as next digit of the result. 
Result so far: 4284.904
Subtracting 84 from 100 leaves us 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 9:
The number 21 fits into 160 7 times, leaving a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 4284.9047
Subtracting 147 from 160 leaves us 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 10:
When dividing 130 by 21, we get 6 with a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 4284.90476
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.

On to step 11:
The number 21 fits into 40 1 times, leaving a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 4284.904761
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.

Going ahead to step 12:
21 goes into 190 9 times with a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 4284.9047619
Deduct 189 from 190 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 13:
When dividing 10 by 21, we get 0 with a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 4284.9047619
Subtract 0 from 10 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Our division results in 4284.9047619 with a remaining 1e-08.