We divide 7836 by 81
The aim is to understand the frequency of 81 in 7836.

On to step 1:
When dividing 7 by 81, we get 0 with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Grab the next digit (8) from the dividend, add it to 7, then carry on: 78 / 81

Advancing to step 2:
If we divide 78 by 81, we get 0 and a remainder of 78.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 78 leaves us with 78.
Grab the next digit (3) from the dividend, add it to 78, then carry on: 783 / 81

On to step 3:
81 goes into 783 9 times with a remainder of 54.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
Subtract 729 from 783 to get 54.
Grab the next digit (6) from the dividend, add it to 54, then carry on: 546 / 81

Let's proceed to step 4:
If we divide 546 by 81, we get 6 and a remainder of 60.
The next digit of our result is 6. 
Result so far: 96.0
Subtracting 486 from 546 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Moving on to step 5:
81 goes into 600 7 times with a remainder of 33.
Put 7 as the next digit of the answer. 
Result so far: 96.7
Subtracting 567 from 600 leaves us with 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

On to step 6:
When dividing 330 by 81, we get 4 with a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 96.74
The remainder is 6 after subtracting 324 from 330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 7:
81 can be fit into 60 0 times, resulting in a remainder of 60.
Record the quotient 0 as the next digit in the result. 
Result so far: 96.74
Subtract 0 from 60 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 8:
When dividing 600 by 81, we get 7 with a remainder of 33.
Use 7 as the next digit of our solution. 
Result so far: 96.7407
If we take 567 away from 600, we end up with 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Moving on to step 9:
If we divide 330 by 81, we get 4 and a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 96.74074
If we subtract 324 from 330, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 10:
If we divide 60 by 81, we get 0 and a remainder of 60.
Write down 0 as next digit of the result. 
Result so far: 96.74074
Deduct 0 from 60 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 11:
The number 81 fits into 600 7 times, leaving a remainder of 33.
Use 7 as the next digit of our solution. 
Result so far: 96.7407407
Deduct 567 from 600 and we're left with 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

On to step 12:
When dividing 330 by 81, we get 4 with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 96.74074074
Subtract 324 from 330 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

The final outcome is 96.74074074, with a leftover of 6e-09.