780852 ÷ 81 
The aim is to understand the frequency of 81 in 780852.

Moving on to step 1:
If we divide 7 by 81, we get 0 and a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Grab the next digit (8) from the dividend, add it to 7, then carry on: 78 / 81

Let's proceed to step 2:
The number 81 fits into 78 0 times, leaving a remainder of 78.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 78 and we're left with 78.
Fetch the next digit (0) from the dividend, attach it to 78 and continue: 780 / 81

Step 3:
If we divide 780 by 81, we get 9 and a remainder of 51.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
Deduct 729 from 780 and we're left with 51.
Fetch the next digit (8) from the dividend, attach it to 51 and continue: 518 / 81

Step 4:
518 divided by 81 is 6 with a remainder of 32.
The next digit of our result is 6. 
Result so far: 96.0
If we take 486 away from 518, we end up with 32.
Include the next digit (5) from the dividend after 32, then repeat: 325 / 81

Moving on to step 5:
If we divide 325 by 81, we get 4 and a remainder of 1.
Write down 4 as next digit of the result. 
Result so far: 964.0
If we subtract 324 from 325, we get 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 81

Going ahead to step 6:
When dividing 12 by 81, we get 0 with a remainder of 12.
Write down 0 as next digit of the result. 
Result so far: 9640.0
If we take 0 away from 12, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 7:
When dividing 120 by 81, we get 1 with a remainder of 39.
Use 1 as the next digit of our solution. 
Result so far: 9640.1
If we subtract 81 from 120, we get 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Advancing to step 8:
When dividing 390 by 81, we get 4 with a remainder of 66.
Record the quotient 4 as the next digit in the result. 
Result so far: 9640.14
The remainder is 66 after subtracting 324 from 390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

On to step 9:
The number 81 fits into 660 8 times, leaving a remainder of 12.
The next digit of our result is 8. 
Result so far: 9640.148
Subtracting 648 from 660 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 10:
The number 81 fits into 120 1 times, leaving a remainder of 39.
Use 1 as the next digit of our solution. 
Result so far: 9640.1481
Subtracting 81 from 120 leaves us with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

On to step 11:
390 divided by 81 is 4 with a remainder of 66.
The number 4 becomes the next digit in our result. 
Result so far: 9640.14814
The remainder is 66 after subtracting 324 from 390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Let's proceed to step 12:
If we divide 660 by 81, we get 8 and a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 9640.148148
If we take 648 away from 660, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 13:
120 divided by 81 is 1 with a remainder of 39.
Record the quotient 1 as the next digit in the result. 
Result so far: 9640.1481481
Subtract 81 from 120 to get 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Let's proceed to step 14:
If we divide 390 by 81, we get 4 and a remainder of 66.
Use 4 as the next digit of our solution. 
Result so far: 9640.14814814
Deduct 324 from 390 and we're left with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

After the division, we end up with 9640.14814814 and a remainder of 6.6e-08.