We look at the division of 489969 by 81 
The aim is to understand the frequency of 81 in 489969.

Let's proceed to step 1:
If we divide 4 by 81, we get 0 and a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Grab the next digit (8) from the dividend, add it to 4, then carry on: 48 / 81

Going ahead to step 2:
The number 81 fits into 48 0 times, leaving a remainder of 48.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 48, we get 48.
Grab the next digit (9) from the dividend, add it to 48, then carry on: 489 / 81

Moving on to step 3:
489 divided by 81 is 6 with a remainder of 3.
Use 6 as the next digit of our solution. 
Result so far: 6.0
The remainder is 3 after subtracting 486 from 489.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 81

Moving on to step 4:
81 goes into 39 0 times with a remainder of 39.
The next digit of our result is 0. 
Result so far: 60.0
If we take 0 away from 39, we end up with 39.
Fetch the next digit (6) from the dividend, attach it to 39 and continue: 396 / 81

Let's proceed to step 5:
The number 81 fits into 396 4 times, leaving a remainder of 72.
The next digit of our result is 4. 
Result so far: 604.0
Deduct 324 from 396 and we're left with 72.
Append the next digit (9) from the dividend to 72 and continue with: 729 / 81

Let's proceed to step 6:
729 divided by 81 is 9 with a remainder of 0.
Use 9 as the next digit of our solution. 
Result so far: 6049.0
If we subtract 729 from 729, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 7:
81 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 6049.0
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 8:
If we divide 0 by 81, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 6049.0
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 6049.0 with a remainder of 0.0.