We're dividing 217596 by 81 
The aim is to understand the frequency of 81 in 217596.

Moving on to step 1:
81 goes into 2 0 times with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 81

Step 2:
81 can be fit into 21 0 times, resulting in a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Bring next digit (7) of the dividend behind the 21 and repeat the process: 217 / 81

Going ahead to step 3:
If we divide 217 by 81, we get 2 and a remainder of 55.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtracting 162 from 217 leaves us with 55.
Fetch the next digit (5) from the dividend, attach it to 55 and continue: 555 / 81

Advancing to step 4:
81 goes into 555 6 times with a remainder of 69.
Use 6 as the next digit of our solution. 
Result so far: 26.0
Deduct 486 from 555 and we're left with 69.
Fetch the next digit (9) from the dividend, attach it to 69 and continue: 699 / 81

Going ahead to step 5:
When dividing 699 by 81, we get 8 with a remainder of 51.
The number 8 becomes the next digit in our result. 
Result so far: 268.0
Deduct 648 from 699 and we're left with 51.
Bring next digit (6) of the dividend behind the 51 and repeat the process: 516 / 81

On to step 6:
When dividing 516 by 81, we get 6 with a remainder of 30.
The number 6 becomes the next digit in our result. 
Result so far: 2686.0
If we take 486 away from 516, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 7:
81 goes into 300 3 times with a remainder of 57.
Use 3 as the next digit of our solution. 
Result so far: 2686.3
Subtract 243 from 300 to get 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

On to step 8:
81 goes into 570 7 times with a remainder of 3.
The next digit of our result is 7. 
Result so far: 2686.37
Subtracting 567 from 570 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 9:
81 can be fit into 30 0 times, resulting in a remainder of 30.
Use 0 as the next digit of our solution. 
Result so far: 2686.37
If we take 0 away from 30, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 10:
300 divided by 81 is 3 with a remainder of 57.
The number 3 becomes the next digit in our result. 
Result so far: 2686.3703
Subtracting 243 from 300 leaves us with 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Advancing to step 11:
81 goes into 570 7 times with a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 2686.37037
Subtracting 567 from 570 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 12:
30 divided by 81 is 0 with a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 2686.37037
If we subtract 0 from 30, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 13:
81 can be fit into 300 3 times, resulting in a remainder of 57.
Use 3 as the next digit of our solution. 
Result so far: 2686.3703703
Subtract 243 from 300 to get 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Moving on to step 14:
81 can be fit into 570 7 times, resulting in a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 2686.37037037
Subtract 567 from 570 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Our division results in 2686.37037037 with a remaining 3e-09.