182991 ÷ 81 
The aim is to understand the frequency of 81 in 182991.

On to step 1:
If we divide 1 by 81, we get 0 and a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Fetch the next digit (8) from the dividend, attach it to 1 and continue: 18 / 81

Going ahead to step 2:
81 goes into 18 0 times with a remainder of 18.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 18 to get 18.
Fetch the next digit (2) from the dividend, attach it to 18 and continue: 182 / 81

Advancing to step 3:
81 can be fit into 182 2 times, resulting in a remainder of 20.
Use 2 as the next digit of our solution. 
Result so far: 2.0
The remainder is 20 after subtracting 162 from 182.
Take the next digit (9) from the dividend and append it to 20, then repeat: 209 / 81

Step 4:
The number 81 fits into 209 2 times, leaving a remainder of 47.
Record the quotient 2 as the next digit in the result. 
Result so far: 22.0
If we take 162 away from 209, we end up with 47.
Append the next digit (9) from the dividend to 47 and continue with: 479 / 81

On to step 5:
If we divide 479 by 81, we get 5 and a remainder of 74.
Record the quotient 5 as the next digit in the result. 
Result so far: 225.0
Subtract 405 from 479 to get 74.
Fetch the next digit (1) from the dividend, attach it to 74 and continue: 741 / 81

On to step 6:
If we divide 741 by 81, we get 9 and a remainder of 12.
Put 9 as the next digit of the answer. 
Result so far: 2259.0
Subtracting 729 from 741 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 7:
81 goes into 120 1 times with a remainder of 39.
The next digit of our result is 1. 
Result so far: 2259.1
Subtracting 81 from 120 leaves us with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Advancing to step 8:
390 divided by 81 is 4 with a remainder of 66.
Record the quotient 4 as the next digit in the result. 
Result so far: 2259.14
Deduct 324 from 390 and we're left with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Advancing to step 9:
81 can be fit into 660 8 times, resulting in a remainder of 12.
The next digit of our result is 8. 
Result so far: 2259.148
Subtracting 648 from 660 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 10:
When dividing 120 by 81, we get 1 with a remainder of 39.
The next digit of our result is 1. 
Result so far: 2259.1481
The remainder is 39 after subtracting 81 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Going ahead to step 11:
The number 81 fits into 390 4 times, leaving a remainder of 66.
Put 4 as the next digit of the answer. 
Result so far: 2259.14814
Deduct 324 from 390 and we're left with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Step 12:
If we divide 660 by 81, we get 8 and a remainder of 12.
The next digit of our result is 8. 
Result so far: 2259.148148
Subtract 648 from 660 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 13:
81 goes into 120 1 times with a remainder of 39.
Record the quotient 1 as the next digit in the result. 
Result so far: 2259.1481481
If we take 81 away from 120, we end up with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Advancing to step 14:
When dividing 390 by 81, we get 4 with a remainder of 66.
Write down 4 as next digit of the result. 
Result so far: 2259.14814814
Subtracting 324 from 390 leaves us with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

After the division, we end up with 2259.14814814 and a remainder of 6.6e-08.