Let's divide 629628 by 81
The aim is to understand the frequency of 81 in 629628.

Advancing to step 1:
If we divide 6 by 81, we get 0 and a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Bring next digit (2) of the dividend behind the 6 and repeat the process: 62 / 81

Moving on to step 2:
When dividing 62 by 81, we get 0 with a remainder of 62.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 62 to get 62.
Take the next digit (9) from the dividend and append it to 62, then repeat: 629 / 81

On to step 3:
81 can be fit into 629 7 times, resulting in a remainder of 62.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
Subtract 567 from 629 to get 62.
Fetch the next digit (6) from the dividend, attach it to 62 and continue: 626 / 81

Moving on to step 4:
When dividing 626 by 81, we get 7 with a remainder of 59.
Use 7 as the next digit of our solution. 
Result so far: 77.0
Subtracting 567 from 626 leaves us with 59.
Bring next digit (2) of the dividend behind the 59 and repeat the process: 592 / 81

Let's proceed to step 5:
When dividing 592 by 81, we get 7 with a remainder of 25.
The number 7 becomes the next digit in our result. 
Result so far: 777.0
Subtract 567 from 592 to get 25.
Append the next digit (8) from the dividend to 25 and continue with: 258 / 81

On to step 6:
258 divided by 81 is 3 with a remainder of 15.
The number 3 becomes the next digit in our result. 
Result so far: 7773.0
The remainder is 15 after subtracting 243 from 258.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 7:
When dividing 150 by 81, we get 1 with a remainder of 69.
The next digit of our result is 1. 
Result so far: 7773.1
Subtract 81 from 150 to 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 8:
The number 81 fits into 690 8 times, leaving a remainder of 42.
Write down 8 as next digit of the result. 
Result so far: 7773.18
If we subtract 648 from 690, we get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

On to step 9:
If we divide 420 by 81, we get 5 and a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 7773.185
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.

Let's proceed to step 10:
The number 81 fits into 150 1 times, leaving a remainder of 69.
Put 1 as the next digit of the answer. 
Result so far: 7773.1851
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 11:
If we divide 690 by 81, we get 8 and a remainder of 42.
The number 8 becomes the next digit in our result. 
Result so far: 7773.18518
Subtract 648 from 690 to get 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 12:
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: 7773.185185
If we subtract 405 from 420, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 13:
The number 81 fits into 150 1 times, leaving a remainder of 69.
The number 1 becomes the next digit in our result. 
Result so far: 7773.1851851
Deduct 81 from 150 and we're left 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.

Step 14:
81 goes into 690 8 times with a remainder of 42.
Put 8 as the next digit of the answer. 
Result so far: 7773.18518518
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.

The final outcome is 7773.18518518, with a leftover of 4.2e-08.