We divide 258945 by 81
The aim is to understand the frequency of 81 in 258945.

On to step 1:
The number 81 fits into 2 0 times, leaving a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Include the next digit (5) from the dividend after 2, then repeat: 25 / 81

On to step 2:
25 divided by 81 is 0 with a remainder of 25.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 25, we end up with 25.
Grab the next digit (8) from the dividend, add it to 25, then carry on: 258 / 81

Let's proceed to step 3:
The number 81 fits into 258 3 times, leaving a remainder of 15.
Put 3 as the next digit of the answer. 
Result so far: 3.0
The remainder is 15 after subtracting 243 from 258.
Append the next digit (9) from the dividend to 15 and continue with: 159 / 81

Moving on to step 4:
When dividing 159 by 81, we get 1 with a remainder of 78.
The next digit of our result is 1. 
Result so far: 31.0
If we subtract 81 from 159, we get 78.
Fetch the next digit (4) from the dividend, attach it to 78 and continue: 784 / 81

Advancing to step 5:
81 goes into 784 9 times with a remainder of 55.
The number 9 becomes the next digit in our result. 
Result so far: 319.0
Deduct 729 from 784 and we're left with 55.
Bring next digit (5) of the dividend behind the 55 and repeat the process: 555 / 81

Let's proceed to step 6:
81 can be fit into 555 6 times, resulting in a remainder of 69.
Put 6 as the next digit of the answer. 
Result so far: 3196.0
If we subtract 486 from 555, 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 7:
690 divided by 81 is 8 with a remainder of 42.
Use 8 as the next digit of our solution. 
Result so far: 3196.8
Subtracting 648 from 690 leaves us 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.

Step 8:
81 can be fit into 420 5 times, resulting in a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 3196.85
The remainder is 15 after subtracting 405 from 420.
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 9:
81 can be fit into 150 1 times, resulting in a remainder of 69.
Use 1 as the next digit of our solution. 
Result so far: 3196.851
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.

Going ahead to step 10:
The number 81 fits into 690 8 times, leaving a remainder of 42.
The next digit of our result is 8. 
Result so far: 3196.8518
Subtracting 648 from 690 leaves us 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 11:
When dividing 420 by 81, we get 5 with a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 3196.85185
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.

Advancing to step 12:
150 divided by 81 is 1 with a remainder of 69.
Put 1 as the next digit of the answer. 
Result so far: 3196.851851
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.

Advancing to step 13:
81 can be fit into 690 8 times, resulting in a remainder of 42.
Use 8 as the next digit of our solution. 
Result so far: 3196.8518518
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.

Moving on to step 14:
When dividing 420 by 81, we get 5 with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 3196.85185185
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.

The quotient of the division is 3196.85185185, and the remainder is 1.5e-08.