We look at the division of 536222 by 81 
The aim is to understand the frequency of 81 in 536222.

Let's proceed to step 1:
81 can be fit into 5 0 times, resulting in a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Fetch the next digit (3) from the dividend, attach it to 5 and continue: 53 / 81

Step 2:
53 divided by 81 is 0 with a remainder of 53.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 53, we end up with 53.
Take the next digit (6) from the dividend and append it to 53, then repeat: 536 / 81

Moving on to step 3:
536 divided by 81 is 6 with a remainder of 50.
Put 6 as the next digit of the answer. 
Result so far: 6.0
If we subtract 486 from 536, we get 50.
Include the next digit (2) from the dividend after 50, then repeat: 502 / 81

On to step 4:
When dividing 502 by 81, we get 6 with a remainder of 16.
The next digit of our result is 6. 
Result so far: 66.0
Subtract 486 from 502 to get 16.
Fetch the next digit (2) from the dividend, attach it to 16 and continue: 162 / 81

Let's proceed to step 5:
162 divided by 81 is 2 with a remainder of 0.
Use 2 as the next digit of our solution. 
Result so far: 662.0
Deduct 162 from 162 and we're left with 0.
Take the next digit (2) from the dividend and append it to 0, then repeat: 2 / 81

Advancing to step 6:
The number 81 fits into 2 0 times, leaving a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 6620.0
If we take 0 away from 2, 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.

Going ahead to step 7:
81 can be fit into 20 0 times, resulting in a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 6620.0
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 8:
The number 81 fits into 200 2 times, leaving a remainder of 38.
Use 2 as the next digit of our solution. 
Result so far: 6620.02
The remainder is 38 after subtracting 162 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Advancing to step 9:
81 can be fit into 380 4 times, resulting in a remainder of 56.
Record the quotient 4 as the next digit in the result. 
Result so far: 6620.024
Deduct 324 from 380 and we're left 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 10:
When dividing 560 by 81, we get 6 with a remainder of 74.
The number 6 becomes the next digit in our result. 
Result so far: 6620.0246
If we take 486 away from 560, we end up with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Going ahead to step 11:
81 can be fit into 740 9 times, resulting in a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 6620.02469
Deduct 729 from 740 and we're left 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.

Advancing to step 12:
81 can be fit into 110 1 times, resulting in a remainder of 29.
Record the quotient 1 as the next digit in the result. 
Result so far: 6620.024691
The remainder is 29 after subtracting 81 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Going ahead to step 13:
The number 81 fits into 290 3 times, leaving a remainder of 47.
Use 3 as the next digit of our solution. 
Result so far: 6620.0246913
Deduct 243 from 290 and we're left 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.

Advancing to step 14:
The number 81 fits into 470 5 times, leaving a remainder of 65.
Put 5 as the next digit of the answer. 
Result so far: 6620.02469135
If we take 405 away from 470, we end up 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.

The final outcome is 6620.02469135, with a leftover of 6.5e-08.