We divide 830607 by 21
The aim is to understand the frequency of 21 in 830607.

Step 1:
21 can be fit into 8 0 times, resulting in a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Fetch the next digit (3) from the dividend, attach it to 8 and continue: 83 / 21

Moving on to step 2:
When dividing 83 by 21, we get 3 with a remainder of 20.
The next digit of our result is 3. 
Result so far: 3.0
Subtracting 63 from 83 leaves us with 20.
Take the next digit (0) from the dividend and append it to 20, then repeat: 200 / 21

On to step 3:
200 divided by 21 is 9 with a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 39.0
If we take 189 away from 200, we end up with 11.
Append the next digit (6) from the dividend to 11 and continue with: 116 / 21

On to step 4:
If we divide 116 by 21, we get 5 and a remainder of 11.
Record the quotient 5 as the next digit in the result. 
Result so far: 395.0
Subtract 105 from 116 to get 11.
Bring next digit (0) of the dividend behind the 11 and repeat the process: 110 / 21

Let's proceed to step 5:
110 divided by 21 is 5 with a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 3955.0
If we subtract 105 from 110, we get 5.
Append the next digit (7) from the dividend to 5 and continue with: 57 / 21

Going ahead to step 6:
21 can be fit into 57 2 times, resulting in a remainder of 15.
The next digit of our result is 2. 
Result so far: 39552.0
Subtracting 42 from 57 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 7:
21 can be fit into 150 7 times, resulting in a remainder of 3.
The next digit of our result is 7. 
Result so far: 39552.7
Subtracting 147 from 150 leaves us 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.

Let's proceed to step 8:
21 goes into 30 1 times with a remainder of 9.
The next digit of our result is 1. 
Result so far: 39552.71
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.

Going ahead to step 9:
21 goes into 90 4 times with a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 39552.714
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.

Moving on to step 10:
The number 21 fits into 60 2 times, leaving a remainder of 18.
The next digit of our result is 2. 
Result so far: 39552.7142
The remainder is 18 after subtracting 42 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 11:
If we divide 180 by 21, we get 8 and a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 39552.71428
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.

Step 12:
120 divided by 21 is 5 with a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 39552.714285
If we take 105 away from 120, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 13:
When dividing 150 by 21, we get 7 with a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 39552.7142857
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.

Step 14:
30 divided by 21 is 1 with a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 39552.71428571
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.

After the division, we end up with 39552.71428571 and a remainder of 9e-09.