We're dividing 800995 by 21 
The aim is to understand the frequency of 21 in 800995.

Advancing to step 1:
The number 21 fits into 8 0 times, leaving a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Take the next digit (0) from the dividend and append it to 8, then repeat: 80 / 21

Moving on to step 2:
If we divide 80 by 21, we get 3 and a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 3.0
The remainder is 17 after subtracting 63 from 80.
Include the next digit (0) from the dividend after 17, then repeat: 170 / 21

Going ahead to step 3:
21 can be fit into 170 8 times, resulting in a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 38.0
Deduct 168 from 170 and we're left with 2.
Append the next digit (9) from the dividend to 2 and continue with: 29 / 21

Advancing to step 4:
When dividing 29 by 21, we get 1 with a remainder of 8.
The number 1 becomes the next digit in our result. 
Result so far: 381.0
Deduct 21 from 29 and we're left with 8.
Bring next digit (9) of the dividend behind the 8 and repeat the process: 89 / 21

On to step 5:
When dividing 89 by 21, we get 4 with a remainder of 5.
Record the quotient 4 as the next digit in the result. 
Result so far: 3814.0
If we subtract 84 from 89, we get 5.
Fetch the next digit (5) from the dividend, attach it to 5 and continue: 55 / 21

Going ahead to step 6:
21 goes into 55 2 times with a remainder of 13.
Record the quotient 2 as the next digit in the result. 
Result so far: 38142.0
Subtracting 42 from 55 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.

Moving on to step 7:
21 goes into 130 6 times with a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 38142.6
If we subtract 126 from 130, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 8:
If we divide 40 by 21, we get 1 and a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 38142.61
Deduct 21 from 40 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.

Moving on to step 9:
The number 21 fits into 190 9 times, leaving a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 38142.619
If we take 189 away from 190, we end up 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.

On to step 10:
21 can be fit into 10 0 times, resulting in a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 38142.619
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.

On to step 11:
100 divided by 21 is 4 with a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 38142.61904
The remainder is 16 after subtracting 84 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 12:
21 goes into 160 7 times with a remainder of 13.
Use 7 as the next digit of our solution. 
Result so far: 38142.619047
If we subtract 147 from 160, we get 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 13:
21 goes into 130 6 times with a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 38142.6190476
If we subtract 126 from 130, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 14:
When dividing 40 by 21, we get 1 with a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 38142.61904761
The remainder is 19 after subtracting 21 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Our division results in 38142.61904761 with a remaining 1.9e-08.