We're dividing 10389998 by 811 
The aim is to understand the frequency of 811 in 10389998.

Step 1:
The number 811 fits into 1 0 times, leaving a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Include the next digit (0) from the dividend after 1, then repeat: 10 / 811

Going ahead to step 2:
10 divided by 811 is 0 with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 10 and we're left with 10.
Take the next digit (3) from the dividend and append it to 10, then repeat: 103 / 811

Step 3:
The number 811 fits into 103 0 times, leaving a remainder of 103.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 103 and we're left with 103.
Bring next digit (8) of the dividend behind the 103 and repeat the process: 1038 / 811

On to step 4:
1038 divided by 811 is 1 with a remainder of 227.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 227 after subtracting 811 from 1038.
Grab the next digit (9) from the dividend, add it to 227, then carry on: 2279 / 811

Advancing to step 5:
811 goes into 2279 2 times with a remainder of 657.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
The remainder is 657 after subtracting 1622 from 2279.
Take the next digit (9) from the dividend and append it to 657, then repeat: 6579 / 811

On to step 6:
6579 divided by 811 is 8 with a remainder of 91.
Write down 8 as next digit of the result. 
Result so far: 128.0
Subtract 6488 from 6579 to get 91.
Grab the next digit (9) from the dividend, add it to 91, then carry on: 919 / 811

Moving on to step 7:
919 divided by 811 is 1 with a remainder of 108.
The number 1 becomes the next digit in our result. 
Result so far: 1281.0
If we subtract 811 from 919, we get 108.
Take the next digit (8) from the dividend and append it to 108, then repeat: 1088 / 811

Step 8:
811 goes into 1088 1 times with a remainder of 277.
Put 1 as the next digit of the answer. 
Result so far: 12811.0
Subtract 811 from 1088 to get 277.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2770, and continue the process.

Moving on to step 9:
811 can be fit into 2770 3 times, resulting in a remainder of 337.
Record the quotient 3 as the next digit in the result. 
Result so far: 12811.3
Deduct 2433 from 2770 and we're left with 337.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3370, and continue the process.

Advancing to step 10:
811 goes into 3370 4 times with a remainder of 126.
The next digit of our result is 4. 
Result so far: 12811.34
Subtracting 3244 from 3370 leaves us with 126.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1260, and continue the process.

Step 11:
811 can be fit into 1260 1 times, resulting in a remainder of 449.
Put 1 as the next digit of the answer. 
Result so far: 12811.341
Deduct 811 from 1260 and we're left with 449.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4490, and continue the process.

Step 12:
811 can be fit into 4490 5 times, resulting in a remainder of 435.
Write down 5 as next digit of the result. 
Result so far: 12811.3415
If we subtract 4055 from 4490, we get 435.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4350, and continue the process.

Advancing to step 13:
811 can be fit into 4350 5 times, resulting in a remainder of 295.
Record the quotient 5 as the next digit in the result. 
Result so far: 12811.34155
If we take 4055 away from 4350, we end up with 295.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2950, and continue the process.

The final outcome is 12811.34155, with a leftover of 0.000295.