973825 ÷ 21 
The aim is to understand the frequency of 21 in 973825.

Moving on to step 1:
If we divide 9 by 21, we get 0 and a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Take the next digit (7) from the dividend and append it to 9, then repeat: 97 / 21

Step 2:
21 can be fit into 97 4 times, resulting in a remainder of 13.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtract 84 from 97 to get 13.
Take the next digit (3) from the dividend and append it to 13, then repeat: 133 / 21

Step 3:
133 divided by 21 is 6 with a remainder of 7.
Use 6 as the next digit of our solution. 
Result so far: 46.0
Deduct 126 from 133 and we're left with 7.
Take the next digit (8) from the dividend and append it to 7, then repeat: 78 / 21

Let's proceed to step 4:
When dividing 78 by 21, we get 3 with a remainder of 15.
Write down 3 as next digit of the result. 
Result so far: 463.0
Subtracting 63 from 78 leaves us with 15.
Include the next digit (2) from the dividend after 15, then repeat: 152 / 21

Moving on to step 5:
152 divided by 21 is 7 with a remainder of 5.
The next digit of our result is 7. 
Result so far: 4637.0
If we subtract 147 from 152, we get 5.
Bring next digit (5) of the dividend behind the 5 and repeat the process: 55 / 21

Let's proceed to step 6:
The number 21 fits into 55 2 times, leaving a remainder of 13.
Put 2 as the next digit of the answer. 
Result so far: 46372.0
Subtract 42 from 55 to 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.

Step 7:
21 can be fit into 130 6 times, resulting in a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 46372.6
If we take 126 away from 130, we end up 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.

Going ahead to step 8:
When dividing 40 by 21, we get 1 with a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 46372.61
Subtract 21 from 40 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 9:
If we divide 190 by 21, we get 9 and a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 46372.619
Subtracting 189 from 190 leaves us 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.

Advancing to step 10:
21 can be fit into 10 0 times, resulting in a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 46372.619
If we take 0 away from 10, we end up 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.

On to step 11:
21 can be fit into 100 4 times, resulting in a remainder of 16.
The next digit of our result is 4. 
Result so far: 46372.61904
If we subtract 84 from 100, we get 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 12:
160 divided by 21 is 7 with a remainder of 13.
The next digit of our result is 7. 
Result so far: 46372.619047
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.

Going ahead to step 13:
If we divide 130 by 21, we get 6 and a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 46372.6190476
Subtract 126 from 130 to 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.

Going ahead to step 14:
When dividing 40 by 21, we get 1 with a remainder of 19.
Record the quotient 1 as the next digit in the result. 
Result so far: 46372.61904761
Subtracting 21 from 40 leaves us 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.

The final result is 46372.61904761 with a remainder of 1.9e-08.