We look at the division of 299753 by 81 
The aim is to understand the frequency of 81 in 299753.

On to step 1:
When dividing 2 by 81, we get 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Grab the next digit (9) from the dividend, add it to 2, then carry on: 29 / 81

Moving on to step 2:
81 goes into 29 0 times with a remainder of 29.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 29, we end up with 29.
Fetch the next digit (9) from the dividend, attach it to 29 and continue: 299 / 81

Step 3:
The number 81 fits into 299 3 times, leaving a remainder of 56.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Deduct 243 from 299 and we're left with 56.
Grab the next digit (7) from the dividend, add it to 56, then carry on: 567 / 81

Going ahead to step 4:
The number 81 fits into 567 7 times, leaving a remainder of 0.
The next digit of our result is 7. 
Result so far: 37.0
If we take 567 away from 567, we end up with 0.
Take the next digit (5) from the dividend and append it to 0, then repeat: 5 / 81

Advancing to step 5:
When dividing 5 by 81, we get 0 with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 370.0
Subtract 0 from 5 to get 5.
Append the next digit (3) from the dividend to 5 and continue with: 53 / 81

Let's proceed to step 6:
53 divided by 81 is 0 with a remainder of 53.
Put 0 as the next digit of the answer. 
Result so far: 3700.0
Subtracting 0 from 53 leaves us with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Moving on to step 7:
530 divided by 81 is 6 with a remainder of 44.
Use 6 as the next digit of our solution. 
Result so far: 3700.6
The remainder is 44 after subtracting 486 from 530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

On to step 8:
81 goes into 440 5 times with a remainder of 35.
The next digit of our result is 5. 
Result so far: 3700.65
The remainder is 35 after subtracting 405 from 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Advancing to step 9:
350 divided by 81 is 4 with a remainder of 26.
The number 4 becomes the next digit in our result. 
Result so far: 3700.654
Subtracting 324 from 350 leaves us with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Moving on to step 10:
81 goes into 260 3 times with a remainder of 17.
The next digit of our result is 3. 
Result so far: 3700.6543
Subtracting 243 from 260 leaves us with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 11:
170 divided by 81 is 2 with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 3700.65432
Subtracting 162 from 170 leaves us 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 12:
The number 81 fits into 80 0 times, leaving a remainder of 80.
The next digit of our result is 0. 
Result so far: 3700.65432
Subtracting 0 from 80 leaves us with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

On to step 13:
81 can be fit into 800 9 times, resulting in a remainder of 71.
Use 9 as the next digit of our solution. 
Result so far: 3700.6543209
Subtracting 729 from 800 leaves us with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

On to step 14:
710 divided by 81 is 8 with a remainder of 62.
Use 8 as the next digit of our solution. 
Result so far: 3700.65432098
Deduct 648 from 710 and we're left with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

The quotient of the division is 3700.65432098, and the remainder is 6.2e-08.