We look at the division of 41373 by 81 
The aim is to understand the frequency of 81 in 41373.

On to step 1:
If we divide 4 by 81, we get 0 and a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Grab the next digit (1) from the dividend, add it to 4, then carry on: 41 / 81

Step 2:
When dividing 41 by 81, we get 0 with a remainder of 41.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 41, we get 41.
Grab the next digit (3) from the dividend, add it to 41, then carry on: 413 / 81

Let's proceed to step 3:
413 divided by 81 is 5 with a remainder of 8.
Use 5 as the next digit of our solution. 
Result so far: 5.0
Subtract 405 from 413 to get 8.
Take the next digit (7) from the dividend and append it to 8, then repeat: 87 / 81

Let's proceed to step 4:
When dividing 87 by 81, we get 1 with a remainder of 6.
Write down 1 as next digit of the result. 
Result so far: 51.0
If we take 81 away from 87, we end up with 6.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 81

Step 5:
The number 81 fits into 63 0 times, leaving a remainder of 63.
Use 0 as the next digit of our solution. 
Result so far: 510.0
Subtracting 0 from 63 leaves us with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Going ahead to step 6:
630 divided by 81 is 7 with a remainder of 63.
The next digit of our result is 7. 
Result so far: 510.7
If we subtract 567 from 630, we get 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Moving on to step 7:
The number 81 fits into 630 7 times, leaving a remainder of 63.
The next digit of our result is 7. 
Result so far: 510.77
Subtract 567 from 630 to get 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Our division results in 510.77 with a remaining 0.063.