We look at the division of 143066 by 81 
The aim is to understand the frequency of 81 in 143066.

Let's proceed to step 1:
The number 81 fits into 1 0 times, leaving a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Bring next digit (4) of the dividend behind the 1 and repeat the process: 14 / 81

Going ahead to step 2:
81 goes into 14 0 times with a remainder of 14.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 14 and we're left with 14.
Append the next digit (3) from the dividend to 14 and continue with: 143 / 81

Moving on to step 3:
81 can be fit into 143 1 times, resulting in a remainder of 62.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 81 away from 143, we end up with 62.
Include the next digit (0) from the dividend after 62, then repeat: 620 / 81

Let's proceed to step 4:
If we divide 620 by 81, we get 7 and a remainder of 53.
The next digit of our result is 7. 
Result so far: 17.0
Deduct 567 from 620 and we're left with 53.
Append the next digit (6) from the dividend to 53 and continue with: 536 / 81

On to step 5:
The number 81 fits into 536 6 times, leaving a remainder of 50.
Use 6 as the next digit of our solution. 
Result so far: 176.0
Subtracting 486 from 536 leaves us with 50.
Grab the next digit (6) from the dividend, add it to 50, then carry on: 506 / 81

Let's proceed to step 6:
81 goes into 506 6 times with a remainder of 20.
Use 6 as the next digit of our solution. 
Result so far: 1766.0
Subtracting 486 from 506 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 7:
81 can be fit into 200 2 times, resulting in a remainder of 38.
Write down 2 as next digit of the result. 
Result so far: 1766.2
Subtracting 162 from 200 leaves us with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Let's proceed to step 8:
When dividing 380 by 81, we get 4 with a remainder of 56.
Write down 4 as next digit of the result. 
Result so far: 1766.24
If we take 324 away from 380, we end up with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Going ahead to step 9:
81 goes into 560 6 times with a remainder of 74.
The next digit of our result is 6. 
Result so far: 1766.246
The remainder is 74 after subtracting 486 from 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Let's proceed to step 10:
81 can be fit into 740 9 times, resulting in a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 1766.2469
If we take 729 away from 740, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 11:
81 can be fit into 110 1 times, resulting in a remainder of 29.
The number 1 becomes the next digit in our result. 
Result so far: 1766.24691
Subtracting 81 from 110 leaves us with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

On to step 12:
81 can be fit into 290 3 times, resulting in a remainder of 47.
Use 3 as the next digit of our solution. 
Result so far: 1766.246913
Subtracting 243 from 290 leaves us with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

On to step 13:
81 goes into 470 5 times with a remainder of 65.
Put 5 as the next digit of the answer. 
Result so far: 1766.2469135
Deduct 405 from 470 and we're left with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Moving on to step 14:
81 can be fit into 650 8 times, resulting in a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 1766.24691358
If we take 648 away from 650, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final result is 1766.24691358 with a remainder of 2e-09.