570791 ÷ 81 
The aim is to understand the frequency of 81 in 570791.

Step 1:
The number 81 fits into 5 0 times, leaving a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Include the next digit (7) from the dividend after 5, then repeat: 57 / 81

Moving on to step 2:
When dividing 57 by 81, we get 0 with a remainder of 57.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 57 and we're left with 57.
Fetch the next digit (0) from the dividend, attach it to 57 and continue: 570 / 81

Advancing to step 3:
When dividing 570 by 81, we get 7 with a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 7.0
If we take 567 away from 570, we end up with 3.
Bring next digit (7) of the dividend behind the 3 and repeat the process: 37 / 81

Going ahead to step 4:
The number 81 fits into 37 0 times, leaving a remainder of 37.
Write down 0 as next digit of the result. 
Result so far: 70.0
Subtracting 0 from 37 leaves us with 37.
Grab the next digit (9) from the dividend, add it to 37, then carry on: 379 / 81

Going ahead to step 5:
If we divide 379 by 81, we get 4 and a remainder of 55.
The number 4 becomes the next digit in our result. 
Result so far: 704.0
Subtract 324 from 379 to get 55.
Grab the next digit (1) from the dividend, add it to 55, then carry on: 551 / 81

Let's proceed to step 6:
When dividing 551 by 81, we get 6 with a remainder of 65.
Use 6 as the next digit of our solution. 
Result so far: 7046.0
The remainder is 65 after subtracting 486 from 551.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Advancing to step 7:
If we divide 650 by 81, we get 8 and a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 7046.8
Subtract 648 from 650 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 8:
The number 81 fits into 20 0 times, leaving a remainder of 20.
The next digit of our result is 0. 
Result so far: 7046.8
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 9:
When dividing 200 by 81, we get 2 with a remainder of 38.
The number 2 becomes the next digit in our result. 
Result so far: 7046.802
Deduct 162 from 200 and we're left with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Moving on to step 10:
The number 81 fits into 380 4 times, leaving a remainder of 56.
The number 4 becomes the next digit in our result. 
Result so far: 7046.8024
If we take 324 away from 380, we end up with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Step 11:
When dividing 560 by 81, we get 6 with a remainder of 74.
Write down 6 as next digit of the result. 
Result so far: 7046.80246
Subtracting 486 from 560 leaves us with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Let's proceed to step 12:
740 divided by 81 is 9 with a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 7046.802469
Deduct 729 from 740 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 13:
81 goes into 110 1 times with a remainder of 29.
The number 1 becomes the next digit in our result. 
Result so far: 7046.8024691
If we subtract 81 from 110, we get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Moving on to step 14:
If we divide 290 by 81, we get 3 and a remainder of 47.
The number 3 becomes the next digit in our result. 
Result so far: 7046.80246913
Deduct 243 from 290 and we're left with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Our division results in 7046.80246913 with a remaining 4.7e-08.