We're dividing 652210 by 81 
The aim is to understand the frequency of 81 in 652210.

On to step 1:
6 divided by 81 is 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Grab the next digit (5) from the dividend, add it to 6, then carry on: 65 / 81

Advancing to step 2:
If we divide 65 by 81, we get 0 and a remainder of 65.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 65 to get 65.
Include the next digit (2) from the dividend after 65, then repeat: 652 / 81

Going ahead to step 3:
652 divided by 81 is 8 with a remainder of 4.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Deduct 648 from 652 and we're left with 4.
Fetch the next digit (2) from the dividend, attach it to 4 and continue: 42 / 81

Moving on to step 4:
42 divided by 81 is 0 with a remainder of 42.
Write down 0 as next digit of the result. 
Result so far: 80.0
Subtracting 0 from 42 leaves us with 42.
Include the next digit (1) from the dividend after 42, then repeat: 421 / 81

Advancing to step 5:
81 can be fit into 421 5 times, resulting in a remainder of 16.
Record the quotient 5 as the next digit in the result. 
Result so far: 805.0
The remainder is 16 after subtracting 405 from 421.
Append the next digit (0) from the dividend to 16 and continue with: 160 / 81

Going ahead to step 6:
81 goes into 160 1 times with a remainder of 79.
Write down 1 as next digit of the result. 
Result so far: 8051.0
The remainder is 79 after subtracting 81 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

On to step 7:
If we divide 790 by 81, we get 9 and a remainder of 61.
Record the quotient 9 as the next digit in the result. 
Result so far: 8051.9
Subtracting 729 from 790 leaves us with 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Going ahead to step 8:
81 can be fit into 610 7 times, resulting in a remainder of 43.
The number 7 becomes the next digit in our result. 
Result so far: 8051.97
If we take 567 away from 610, we end up with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

On to step 9:
430 divided by 81 is 5 with a remainder of 25.
Write down 5 as next digit of the result. 
Result so far: 8051.975
The remainder is 25 after subtracting 405 from 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Moving on to step 10:
The number 81 fits into 250 3 times, leaving a remainder of 7.
Put 3 as the next digit of the answer. 
Result so far: 8051.9753
Subtracting 243 from 250 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 11:
If we divide 70 by 81, we get 0 and a remainder of 70.
Write down 0 as next digit of the result. 
Result so far: 8051.9753
Subtract 0 from 70 to get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Going ahead to step 12:
The number 81 fits into 700 8 times, leaving a remainder of 52.
Put 8 as the next digit of the answer. 
Result so far: 8051.975308
Deduct 648 from 700 and we're left with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Step 13:
If we divide 520 by 81, we get 6 and a remainder of 34.
Use 6 as the next digit of our solution. 
Result so far: 8051.9753086
Deduct 486 from 520 and we're left with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Moving on to step 14:
If we divide 340 by 81, we get 4 and a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 8051.97530864
If we subtract 324 from 340, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

After the division, we end up with 8051.97530864 and a remainder of 1.6e-08.