212559 ÷ 81 
The aim is to understand the frequency of 81 in 212559.

Let's proceed to step 1:
When dividing 2 by 81, we get 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 81

Let's proceed to step 2:
When dividing 21 by 81, we get 0 with a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Include the next digit (2) from the dividend after 21, then repeat: 212 / 81

Let's proceed to step 3:
If we divide 212 by 81, we get 2 and a remainder of 50.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we subtract 162 from 212, we get 50.
Bring next digit (5) of the dividend behind the 50 and repeat the process: 505 / 81

Step 4:
81 can be fit into 505 6 times, resulting in a remainder of 19.
The number 6 becomes the next digit in our result. 
Result so far: 26.0
If we subtract 486 from 505, we get 19.
Append the next digit (5) from the dividend to 19 and continue with: 195 / 81

Going ahead to step 5:
When dividing 195 by 81, we get 2 with a remainder of 33.
The next digit of our result is 2. 
Result so far: 262.0
If we take 162 away from 195, we end up with 33.
Fetch the next digit (9) from the dividend, attach it to 33 and continue: 339 / 81

Advancing to step 6:
81 can be fit into 339 4 times, resulting in a remainder of 15.
Write down 4 as next digit of the result. 
Result so far: 2624.0
Deduct 324 from 339 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 7:
If we divide 150 by 81, we get 1 and a remainder of 69.
Write down 1 as next digit of the result. 
Result so far: 2624.1
Subtracting 81 from 150 leaves us with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

On to step 8:
81 can be fit into 690 8 times, resulting in a remainder of 42.
The next digit of our result is 8. 
Result so far: 2624.18
The remainder is 42 after subtracting 648 from 690.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Step 9:
If we divide 420 by 81, we get 5 and a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 2624.185
If we take 405 away from 420, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 10:
The number 81 fits into 150 1 times, leaving a remainder of 69.
Record the quotient 1 as the next digit in the result. 
Result so far: 2624.1851
If we subtract 81 from 150, we get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

On to step 11:
If we divide 690 by 81, we get 8 and a remainder of 42.
Record the quotient 8 as the next digit in the result. 
Result so far: 2624.18518
If we take 648 away from 690, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Going ahead to step 12:
81 can be fit into 420 5 times, resulting in a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 2624.185185
If we subtract 405 from 420, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 13:
81 can be fit into 150 1 times, resulting in a remainder of 69.
The number 1 becomes the next digit in our result. 
Result so far: 2624.1851851
Subtract 81 from 150 to get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Step 14:
If we divide 690 by 81, we get 8 and a remainder of 42.
Use 8 as the next digit of our solution. 
Result so far: 2624.18518518
If we take 648 away from 690, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

The quotient of the division is 2624.18518518, and the remainder is 4.2e-08.