931496 divided by 21 
The aim is to understand the frequency of 21 in 931496.

Advancing to step 1:
When dividing 9 by 21, we get 0 with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Include the next digit (3) from the dividend after 9, then repeat: 93 / 21

Advancing to step 2:
When dividing 93 by 21, we get 4 with a remainder of 9.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Subtract 84 from 93 to get 9.
Bring next digit (1) of the dividend behind the 9 and repeat the process: 91 / 21

Moving on to step 3:
If we divide 91 by 21, we get 4 and a remainder of 7.
Write down 4 as next digit of the result. 
Result so far: 44.0
If we take 84 away from 91, we end up with 7.
Take the next digit (4) from the dividend and append it to 7, then repeat: 74 / 21

Going ahead to step 4:
21 can be fit into 74 3 times, resulting in a remainder of 11.
Record the quotient 3 as the next digit in the result. 
Result so far: 443.0
If we take 63 away from 74, we end up with 11.
Bring next digit (9) of the dividend behind the 11 and repeat the process: 119 / 21

Moving on to step 5:
The number 21 fits into 119 5 times, leaving a remainder of 14.
Use 5 as the next digit of our solution. 
Result so far: 4435.0
If we subtract 105 from 119, we get 14.
Bring next digit (6) of the dividend behind the 14 and repeat the process: 146 / 21

Advancing to step 6:
21 can be fit into 146 6 times, resulting in a remainder of 20.
Record the quotient 6 as the next digit in the result. 
Result so far: 44356.0
If we take 126 away from 146, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 7:
200 divided by 21 is 9 with a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 44356.9
Subtract 189 from 200 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 8:
110 divided by 21 is 5 with a remainder of 5.
The next digit of our result is 5. 
Result so far: 44356.95
Subtract 105 from 110 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 9:
The number 21 fits into 50 2 times, leaving a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 44356.952
If we take 42 away from 50, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 10:
When dividing 80 by 21, we get 3 with a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 44356.9523
Subtract 63 from 80 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Step 11:
The number 21 fits into 170 8 times, leaving a remainder of 2.
The next digit of our result is 8. 
Result so far: 44356.95238
If we take 168 away from 170, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 12:
21 can be fit into 20 0 times, resulting in a remainder of 20.
The next digit of our result is 0. 
Result so far: 44356.95238
Deduct 0 from 20 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 13:
21 can be fit into 200 9 times, resulting in a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 44356.9523809
The remainder is 11 after subtracting 189 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 14:
If we divide 110 by 21, we get 5 and a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 44356.95238095
If we subtract 105 from 110, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Our division results in 44356.95238095 with a remaining 5e-09.