Let's divide 21289923 by 823
The aim is to understand the frequency of 823 in 21289923.

Let's proceed to step 1:
If we divide 2 by 823, we get 0 and a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 823

Advancing to step 2:
When dividing 21 by 823, we get 0 with a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Append the next digit (2) from the dividend to 21 and continue with: 212 / 823

Let's proceed to step 3:
The number 823 fits into 212 0 times, leaving a remainder of 212.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 212 and we're left with 212.
Append the next digit (8) from the dividend to 212 and continue with: 2128 / 823

Advancing to step 4:
If we divide 2128 by 823, we get 2 and a remainder of 482.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Deduct 1646 from 2128 and we're left with 482.
Take the next digit (9) from the dividend and append it to 482, then repeat: 4829 / 823

On to step 5:
823 can be fit into 4829 5 times, resulting in a remainder of 714.
Record the quotient 5 as the next digit in the result. 
Result so far: 25.0
If we take 4115 away from 4829, we end up with 714.
Take the next digit (9) from the dividend and append it to 714, then repeat: 7149 / 823

Going ahead to step 6:
823 can be fit into 7149 8 times, resulting in a remainder of 565.
The next digit of our result is 8. 
Result so far: 258.0
Subtracting 6584 from 7149 leaves us with 565.
Grab the next digit (2) from the dividend, add it to 565, then carry on: 5652 / 823

Going ahead to step 7:
823 goes into 5652 6 times with a remainder of 714.
The number 6 becomes the next digit in our result. 
Result so far: 2586.0
If we subtract 4938 from 5652, we get 714.
Append the next digit (3) from the dividend to 714 and continue with: 7143 / 823

On to step 8:
If we divide 7143 by 823, we get 8 and a remainder of 559.
The number 8 becomes the next digit in our result. 
Result so far: 25868.0
Subtracting 6584 from 7143 leaves us with 559.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5590, and continue the process.

Moving on to step 9:
5590 divided by 823 is 6 with a remainder of 652.
Record the quotient 6 as the next digit in the result. 
Result so far: 25868.6
Subtract 4938 from 5590 to get 652.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6520, and continue the process.

On to step 10:
When dividing 6520 by 823, we get 7 with a remainder of 759.
Write down 7 as next digit of the result. 
Result so far: 25868.67
If we subtract 5761 from 6520, we get 759.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7590, and continue the process.

Advancing to step 11:
823 can be fit into 7590 9 times, resulting in a remainder of 183.
Use 9 as the next digit of our solution. 
Result so far: 25868.679
The remainder is 183 after subtracting 7407 from 7590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1830, and continue the process.

Step 12:
823 goes into 1830 2 times with a remainder of 184.
Record the quotient 2 as the next digit in the result. 
Result so far: 25868.6792
Deduct 1646 from 1830 and we're left with 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

Step 13:
When dividing 1840 by 823, we get 2 with a remainder of 194.
Write down 2 as next digit of the result. 
Result so far: 25868.67922
Subtract 1646 from 1840 to get 194.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1940, and continue the process.

The final result is 25868.67922 with a remainder of 0.000194.