363975 ÷ 81 
The aim is to understand the frequency of 81 in 363975.

Moving on to step 1:
When dividing 3 by 81, we get 0 with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Fetch the next digit (6) from the dividend, attach it to 3 and continue: 36 / 81

Going ahead to step 2:
If we divide 36 by 81, we get 0 and a remainder of 36.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 36, we end up with 36.
Bring next digit (3) of the dividend behind the 36 and repeat the process: 363 / 81

Advancing to step 3:
The number 81 fits into 363 4 times, leaving a remainder of 39.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we take 324 away from 363, we end up with 39.
Include the next digit (9) from the dividend after 39, then repeat: 399 / 81

Let's proceed to step 4:
81 can be fit into 399 4 times, resulting in a remainder of 75.
Record the quotient 4 as the next digit in the result. 
Result so far: 44.0
The remainder is 75 after subtracting 324 from 399.
Append the next digit (7) from the dividend to 75 and continue with: 757 / 81

Let's proceed to step 5:
757 divided by 81 is 9 with a remainder of 28.
Use 9 as the next digit of our solution. 
Result so far: 449.0
If we subtract 729 from 757, we get 28.
Take the next digit (5) from the dividend and append it to 28, then repeat: 285 / 81

Let's proceed to step 6:
When dividing 285 by 81, we get 3 with a remainder of 42.
The number 3 becomes the next digit in our result. 
Result so far: 4493.0
If we take 243 away from 285, 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.

Let's proceed to step 7:
81 can be fit into 420 5 times, resulting in a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 4493.5
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.

Step 8:
The number 81 fits into 150 1 times, leaving a remainder of 69.
Put 1 as the next digit of the answer. 
Result so far: 4493.51
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.

Going ahead to step 9:
The number 81 fits into 690 8 times, leaving a remainder of 42.
The number 8 becomes the next digit in our result. 
Result so far: 4493.518
If we subtract 648 from 690, we get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

On to step 10:
81 goes into 420 5 times with a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 4493.5185
Subtract 405 from 420 to 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.

On to step 11:
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: 4493.51851
The remainder is 69 after subtracting 81 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Step 12:
If we divide 690 by 81, we get 8 and a remainder of 42.
The next digit of our result is 8. 
Result so far: 4493.518518
If we subtract 648 from 690, we get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Step 13:
81 can be fit into 420 5 times, resulting in a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 4493.5185185
Subtracting 405 from 420 leaves us 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 14:
The number 81 fits into 150 1 times, leaving a remainder of 69.
Write down 1 as next digit of the result. 
Result so far: 4493.51851851
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.

The quotient of the division is 4493.51851851, and the remainder is 6.9e-08.