85973504 divided by 81 
The aim is to understand the frequency of 81 in 85973504.

Let's proceed to step 1:
8 divided by 81 is 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Take the next digit (5) from the dividend and append it to 8, then repeat: 85 / 81

On to step 2:
81 goes into 85 1 times with a remainder of 4.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 4 after subtracting 81 from 85.
Bring next digit (9) of the dividend behind the 4 and repeat the process: 49 / 81

Moving on to step 3:
49 divided by 81 is 0 with a remainder of 49.
Write down 0 as next digit of the result. 
Result so far: 10.0
Subtract 0 from 49 to get 49.
Take the next digit (7) from the dividend and append it to 49, then repeat: 497 / 81

Let's proceed to step 4:
The number 81 fits into 497 6 times, leaving a remainder of 11.
The next digit of our result is 6. 
Result so far: 106.0
If we subtract 486 from 497, we get 11.
Append the next digit (3) from the dividend to 11 and continue with: 113 / 81

Let's proceed to step 5:
81 goes into 113 1 times with a remainder of 32.
Use 1 as the next digit of our solution. 
Result so far: 1061.0
Subtracting 81 from 113 leaves us with 32.
Take the next digit (5) from the dividend and append it to 32, then repeat: 325 / 81

Advancing to step 6:
325 divided by 81 is 4 with a remainder of 1.
Use 4 as the next digit of our solution. 
Result so far: 10614.0
If we take 324 away from 325, we end up with 1.
Bring next digit (0) of the dividend behind the 1 and repeat the process: 10 / 81

Going ahead to step 7:
81 can be fit into 10 0 times, resulting in a remainder of 10.
The next digit of our result is 0. 
Result so far: 106140.0
Subtract 0 from 10 to get 10.
Append the next digit (4) from the dividend to 10 and continue with: 104 / 81

Let's proceed to step 8:
81 can be fit into 104 1 times, resulting in a remainder of 23.
Put 1 as the next digit of the answer. 
Result so far: 1061401.0
If we take 81 away from 104, we end up with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Let's proceed to step 9:
When dividing 230 by 81, we get 2 with a remainder of 68.
Use 2 as the next digit of our solution. 
Result so far: 1061401.2
If we subtract 162 from 230, we get 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Moving on to step 10:
81 goes into 680 8 times with a remainder of 32.
Put 8 as the next digit of the answer. 
Result so far: 1061401.28
Deduct 648 from 680 and we're left with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Step 11:
320 divided by 81 is 3 with a remainder of 77.
Write down 3 as next digit of the result. 
Result so far: 1061401.283
The remainder is 77 after subtracting 243 from 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

Advancing to step 12:
81 can be fit into 770 9 times, resulting in a remainder of 41.
Record the quotient 9 as the next digit in the result. 
Result so far: 1061401.2839
Subtracting 729 from 770 leaves us with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Moving on to step 13:
81 can be fit into 410 5 times, resulting in a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 1061401.28395
If we subtract 405 from 410, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 14:
When dividing 50 by 81, we get 0 with a remainder of 50.
The number 0 becomes the next digit in our result. 
Result so far: 1061401.28395
The remainder is 50 after subtracting 0 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

On to step 15:
The number 81 fits into 500 6 times, leaving a remainder of 14.
The next digit of our result is 6. 
Result so far: 1061401.2839506
The remainder is 14 after subtracting 486 from 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 16:
If we divide 140 by 81, we get 1 and a remainder of 59.
The next digit of our result is 1. 
Result so far: 1061401.28395061
If we subtract 81 from 140, we get 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

The final result is 1061401.28395061 with a remainder of 5.9e-08.