We look at the division of 142924 by 81 
The aim is to understand the frequency of 81 in 142924.

On to step 1:
When dividing 1 by 81, we get 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Grab the next digit (4) from the dividend, add it to 1, then carry on: 14 / 81

Advancing to step 2:
81 goes into 14 0 times with a remainder of 14.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 14 to get 14.
Include the next digit (2) from the dividend after 14, then repeat: 142 / 81

Going ahead to step 3:
142 divided by 81 is 1 with a remainder of 61.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 81 from 142 and we're left with 61.
Append the next digit (9) from the dividend to 61 and continue with: 619 / 81

Advancing to step 4:
619 divided by 81 is 7 with a remainder of 52.
Write down 7 as next digit of the result. 
Result so far: 17.0
If we subtract 567 from 619, we get 52.
Grab the next digit (2) from the dividend, add it to 52, then carry on: 522 / 81

Advancing to step 5:
If we divide 522 by 81, we get 6 and a remainder of 36.
Use 6 as the next digit of our solution. 
Result so far: 176.0
Deduct 486 from 522 and we're left with 36.
Fetch the next digit (4) from the dividend, attach it to 36 and continue: 364 / 81

Advancing to step 6:
81 goes into 364 4 times with a remainder of 40.
Put 4 as the next digit of the answer. 
Result so far: 1764.0
Subtract 324 from 364 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 7:
If we divide 400 by 81, we get 4 and a remainder of 76.
The number 4 becomes the next digit in our result. 
Result so far: 1764.4
Subtracting 324 from 400 leaves us with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Step 8:
If we divide 760 by 81, we get 9 and a remainder of 31.
Write down 9 as next digit of the result. 
Result so far: 1764.49
Subtracting 729 from 760 leaves us with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

On to step 9:
310 divided by 81 is 3 with a remainder of 67.
Use 3 as the next digit of our solution. 
Result so far: 1764.493
If we subtract 243 from 310, we get 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Step 10:
670 divided by 81 is 8 with a remainder of 22.
The number 8 becomes the next digit in our result. 
Result so far: 1764.4938
If we take 648 away from 670, we end up with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Let's proceed to step 11:
81 goes into 220 2 times with a remainder of 58.
Record the quotient 2 as the next digit in the result. 
Result so far: 1764.49382
If we subtract 162 from 220, we get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Advancing to step 12:
If we divide 580 by 81, we get 7 and a remainder of 13.
Use 7 as the next digit of our solution. 
Result so far: 1764.493827
Deduct 567 from 580 and we're left 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.

Moving on to step 13:
The number 81 fits into 130 1 times, leaving a remainder of 49.
The number 1 becomes the next digit in our result. 
Result so far: 1764.4938271
Subtract 81 from 130 to get 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Step 14:
490 divided by 81 is 6 with a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 1764.49382716
Subtract 486 from 490 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.

The final outcome is 1764.49382716, with a leftover of 4e-09.