We divide 70571 by 81
The aim is to understand the frequency of 81 in 70571.

On to step 1:
The number 81 fits into 7 0 times, leaving a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Append the next digit (0) from the dividend to 7 and continue with: 70 / 81

On to step 2:
81 can be fit into 70 0 times, resulting in a remainder of 70.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 70 after subtracting 0 from 70.
Include the next digit (5) from the dividend after 70, then repeat: 705 / 81

Moving on to step 3:
If we divide 705 by 81, we get 8 and a remainder of 57.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
The remainder is 57 after subtracting 648 from 705.
Bring next digit (7) of the dividend behind the 57 and repeat the process: 577 / 81

Step 4:
When dividing 577 by 81, we get 7 with a remainder of 10.
Put 7 as the next digit of the answer. 
Result so far: 87.0
Subtract 567 from 577 to get 10.
Grab the next digit (1) from the dividend, add it to 10, then carry on: 101 / 81

Moving on to step 5:
101 divided by 81 is 1 with a remainder of 20.
Put 1 as the next digit of the answer. 
Result so far: 871.0
Subtract 81 from 101 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 6:
The number 81 fits into 200 2 times, leaving a remainder of 38.
The next digit of our result is 2. 
Result so far: 871.2
If we take 162 away from 200, we end up 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.

Let's proceed to step 7:
When dividing 380 by 81, we get 4 with a remainder of 56.
Record the quotient 4 as the next digit in the result. 
Result so far: 871.24
Subtracting 324 from 380 leaves us 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.

Going ahead to step 8:
If we divide 560 by 81, we get 6 and a remainder of 74.
The next digit of our result is 6. 
Result so far: 871.246
Subtract 486 from 560 to get 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 9:
The number 81 fits into 740 9 times, leaving a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 871.2469
The remainder is 11 after subtracting 729 from 740.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 10:
If we divide 110 by 81, we get 1 and a remainder of 29.
The number 1 becomes the next digit in our result. 
Result so far: 871.24691
Subtracting 81 from 110 leaves us with 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 11:
290 divided by 81 is 3 with a remainder of 47.
Record the quotient 3 as the next digit in the result. 
Result so far: 871.246913
If we take 243 away from 290, we end up 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.

Going ahead to step 12:
If we divide 470 by 81, we get 5 and a remainder of 65.
Use 5 as the next digit of our solution. 
Result so far: 871.2469135
If we subtract 405 from 470, we get 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

On to step 13:
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: 871.24691358
If we subtract 648 from 650, we 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.

The quotient of the division is 871.24691358, and the remainder is 2e-09.