We divide 825849 by 21
The aim is to understand the frequency of 21 in 825849.

Let's proceed to step 1:
21 can be fit into 8 0 times, resulting in a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (2) from the dividend and append it to 8, then repeat: 82 / 21

Moving on to step 2:
21 can be fit into 82 3 times, resulting in a remainder of 19.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
The remainder is 19 after subtracting 63 from 82.
Include the next digit (5) from the dividend after 19, then repeat: 195 / 21

Step 3:
21 goes into 195 9 times with a remainder of 6.
Put 9 as the next digit of the answer. 
Result so far: 39.0
Subtracting 189 from 195 leaves us with 6.
Include the next digit (8) from the dividend after 6, then repeat: 68 / 21

Moving on to step 4:
The number 21 fits into 68 3 times, leaving a remainder of 5.
Use 3 as the next digit of our solution. 
Result so far: 393.0
Subtracting 63 from 68 leaves us with 5.
Take the next digit (4) from the dividend and append it to 5, then repeat: 54 / 21

Step 5:
If we divide 54 by 21, we get 2 and a remainder of 12.
The next digit of our result is 2. 
Result so far: 3932.0
Deduct 42 from 54 and we're left with 12.
Append the next digit (9) from the dividend to 12 and continue with: 129 / 21

On to step 6:
When dividing 129 by 21, we get 6 with a remainder of 3.
Record the quotient 6 as the next digit in the result. 
Result so far: 39326.0
The remainder is 3 after subtracting 126 from 129.
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 7:
When dividing 30 by 21, we get 1 with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 39326.1
If we take 21 away from 30, we end up 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.

Moving on to step 8:
21 can be fit into 90 4 times, resulting in a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 39326.14
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.

Advancing to step 9:
21 can be fit into 60 2 times, resulting in a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 39326.142
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.

Step 10:
180 divided by 21 is 8 with a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 39326.1428
The remainder is 12 after subtracting 168 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 11:
The number 21 fits into 120 5 times, leaving a remainder of 15.
The next digit of our result is 5. 
Result so far: 39326.14285
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:
If we divide 150 by 21, we get 7 and a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 39326.142857
If we take 147 away from 150, we end up 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.

Advancing to step 13:
21 can be fit into 30 1 times, resulting in a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 39326.1428571
Subtract 21 from 30 to 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.

Moving on to step 14:
21 can be fit into 90 4 times, resulting in a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 39326.14285714
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.

Our division results in 39326.14285714 with a remaining 6e-09.