823057 ÷ 21 
The aim is to understand the frequency of 21 in 823057.

Let's proceed to step 1:
21 goes into 8 0 times with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Grab the next digit (2) from the dividend, add it to 8, then carry on: 82 / 21

Going ahead to step 2:
21 goes into 82 3 times with a remainder of 19.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Deduct 63 from 82 and we're left with 19.
Take the next digit (3) from the dividend and append it to 19, then repeat: 193 / 21

On to step 3:
21 goes into 193 9 times with a remainder of 4.
Write down 9 as next digit of the result. 
Result so far: 39.0
If we subtract 189 from 193, we get 4.
Grab the next digit (0) from the dividend, add it to 4, then carry on: 40 / 21

Advancing to step 4:
The number 21 fits into 40 1 times, leaving a remainder of 19.
The next digit of our result is 1. 
Result so far: 391.0
Deduct 21 from 40 and we're left with 19.
Take the next digit (5) from the dividend and append it to 19, then repeat: 195 / 21

Advancing to step 5:
When dividing 195 by 21, we get 9 with a remainder of 6.
Record the quotient 9 as the next digit in the result. 
Result so far: 3919.0
Deduct 189 from 195 and we're left with 6.
Take the next digit (7) from the dividend and append it to 6, then repeat: 67 / 21

Moving on to step 6:
If we divide 67 by 21, we get 3 and a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 39193.0
Subtract 63 from 67 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 7:
40 divided by 21 is 1 with a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 39193.1
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 8:
190 divided by 21 is 9 with a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 39193.19
The remainder is 1 after subtracting 189 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 9:
If we divide 10 by 21, we get 0 and a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 39193.19
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 10:
The number 21 fits into 100 4 times, leaving a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 39193.1904
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.

Step 11:
When dividing 160 by 21, we get 7 with a remainder of 13.
The next digit of our result is 7. 
Result so far: 39193.19047
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.

Let's proceed to step 12:
130 divided by 21 is 6 with a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 39193.190476
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 13:
40 divided by 21 is 1 with a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 39193.1904761
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.

Advancing to step 14:
21 can be fit into 190 9 times, resulting in a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 39193.19047619
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.

The quotient of the division is 39193.19047619, and the remainder is 1e-09.