We look at the division of 18789781 by 811 
The aim is to understand the frequency of 811 in 18789781.

On to step 1:
When dividing 1 by 811, we get 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Include the next digit (8) from the dividend after 1, then repeat: 18 / 811

Step 2:
811 goes into 18 0 times with a remainder of 18.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 18, we end up with 18.
Bring next digit (7) of the dividend behind the 18 and repeat the process: 187 / 811

Let's proceed to step 3:
The number 811 fits into 187 0 times, leaving a remainder of 187.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 187, we end up with 187.
Append the next digit (8) from the dividend to 187 and continue with: 1878 / 811

Let's proceed to step 4:
When dividing 1878 by 811, we get 2 with a remainder of 256.
Write down 2 as next digit of the result. 
Result so far: 2.0
The remainder is 256 after subtracting 1622 from 1878.
Include the next digit (9) from the dividend after 256, then repeat: 2569 / 811

Advancing to step 5:
811 goes into 2569 3 times with a remainder of 136.
Record the quotient 3 as the next digit in the result. 
Result so far: 23.0
Subtract 2433 from 2569 to get 136.
Bring next digit (7) of the dividend behind the 136 and repeat the process: 1367 / 811

Advancing to step 6:
When dividing 1367 by 811, we get 1 with a remainder of 556.
Write down 1 as next digit of the result. 
Result so far: 231.0
The remainder is 556 after subtracting 811 from 1367.
Include the next digit (8) from the dividend after 556, then repeat: 5568 / 811

On to step 7:
The number 811 fits into 5568 6 times, leaving a remainder of 702.
Write down 6 as next digit of the result. 
Result so far: 2316.0
Subtract 4866 from 5568 to get 702.
Include the next digit (1) from the dividend after 702, then repeat: 7021 / 811

On to step 8:
When dividing 7021 by 811, we get 8 with a remainder of 533.
Write down 8 as next digit of the result. 
Result so far: 23168.0
Subtracting 6488 from 7021 leaves us with 533.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5330, and continue the process.

Step 9:
When dividing 5330 by 811, we get 6 with a remainder of 464.
Write down 6 as next digit of the result. 
Result so far: 23168.6
The remainder is 464 after subtracting 4866 from 5330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4640, and continue the process.

Moving on to step 10:
The number 811 fits into 4640 5 times, leaving a remainder of 585.
Use 5 as the next digit of our solution. 
Result so far: 23168.65
If we subtract 4055 from 4640, we get 585.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5850, and continue the process.

Step 11:
When dividing 5850 by 811, we get 7 with a remainder of 173.
Record the quotient 7 as the next digit in the result. 
Result so far: 23168.657
Subtract 5677 from 5850 to get 173.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1730, and continue the process.

On to step 12:
811 goes into 1730 2 times with a remainder of 108.
Record the quotient 2 as the next digit in the result. 
Result so far: 23168.6572
The remainder is 108 after subtracting 1622 from 1730.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

Let's proceed to step 13:
811 can be fit into 1080 1 times, resulting in a remainder of 269.
Write down 1 as next digit of the result. 
Result so far: 23168.65721
Deduct 811 from 1080 and we're left with 269.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2690, and continue the process.

Moving on to step 14:
The number 811 fits into 2690 3 times, leaving a remainder of 257.
Write down 3 as next digit of the result. 
Result so far: 23168.657213
Subtracting 2433 from 2690 leaves us with 257.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2570, and continue the process.

Step 15:
The number 811 fits into 2570 3 times, leaving a remainder of 137.
Use 3 as the next digit of our solution. 
Result so far: 23168.6572133
Deduct 2433 from 2570 and we're left with 137.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1370, and continue the process.

The final outcome is 23168.6572133, with a leftover of 1.37e-06.