We look at the division of 81409947 by 812 
The aim is to understand the frequency of 812 in 81409947.

On to step 1:
The number 812 fits into 8 0 times, leaving a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 812

Step 2:
If we divide 81 by 812, we get 0 and a remainder of 81.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 81 to get 81.
Take the next digit (4) from the dividend and append it to 81, then repeat: 814 / 812

Advancing to step 3:
812 goes into 814 1 times with a remainder of 2.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 812 from 814, we get 2.
Grab the next digit (0) from the dividend, add it to 2, then carry on: 20 / 812

Step 4:
812 can be fit into 20 0 times, resulting in a remainder of 20.
The next digit of our result is 0. 
Result so far: 10.0
If we take 0 away from 20, we end up with 20.
Grab the next digit (9) from the dividend, add it to 20, then carry on: 209 / 812

Going ahead to step 5:
812 can be fit into 209 0 times, resulting in a remainder of 209.
Use 0 as the next digit of our solution. 
Result so far: 100.0
If we subtract 0 from 209, we get 209.
Grab the next digit (9) from the dividend, add it to 209, then carry on: 2099 / 812

Moving on to step 6:
812 goes into 2099 2 times with a remainder of 475.
Use 2 as the next digit of our solution. 
Result so far: 1002.0
The remainder is 475 after subtracting 1624 from 2099.
Include the next digit (4) from the dividend after 475, then repeat: 4754 / 812

Moving on to step 7:
When dividing 4754 by 812, we get 5 with a remainder of 694.
Use 5 as the next digit of our solution. 
Result so far: 10025.0
The remainder is 694 after subtracting 4060 from 4754.
Bring next digit (7) of the dividend behind the 694 and repeat the process: 6947 / 812

Going ahead to step 8:
812 can be fit into 6947 8 times, resulting in a remainder of 451.
Put 8 as the next digit of the answer. 
Result so far: 100258.0
Subtracting 6496 from 6947 leaves us with 451.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4510, and continue the process.

Moving on to step 9:
If we divide 4510 by 812, we get 5 and a remainder of 450.
Write down 5 as next digit of the result. 
Result so far: 100258.5
If we take 4060 away from 4510, we end up with 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4500, and continue the process.

Going ahead to step 10:
The number 812 fits into 4500 5 times, leaving a remainder of 440.
Write down 5 as next digit of the result. 
Result so far: 100258.55
If we subtract 4060 from 4500, we get 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

The quotient of the division is 100258.55, and the remainder is 0.44.