We look at the division of 45890441 by 815 
The aim is to understand the frequency of 815 in 45890441.

Let's proceed to step 1:
When dividing 4 by 815, we get 0 with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Include the next digit (5) from the dividend after 4, then repeat: 45 / 815

On to step 2:
45 divided by 815 is 0 with a remainder of 45.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 45, we end up with 45.
Bring next digit (8) of the dividend behind the 45 and repeat the process: 458 / 815

Going ahead to step 3:
815 can be fit into 458 0 times, resulting in a remainder of 458.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 458, we end up with 458.
Grab the next digit (9) from the dividend, add it to 458, then carry on: 4589 / 815

Going ahead to step 4:
815 can be fit into 4589 5 times, resulting in a remainder of 514.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
If we subtract 4075 from 4589, we get 514.
Bring next digit (0) of the dividend behind the 514 and repeat the process: 5140 / 815

Moving on to step 5:
The number 815 fits into 5140 6 times, leaving a remainder of 250.
The next digit of our result is 6. 
Result so far: 56.0
The remainder is 250 after subtracting 4890 from 5140.
Append the next digit (4) from the dividend to 250 and continue with: 2504 / 815

Advancing to step 6:
815 can be fit into 2504 3 times, resulting in a remainder of 59.
Put 3 as the next digit of the answer. 
Result so far: 563.0
Deduct 2445 from 2504 and we're left with 59.
Include the next digit (4) from the dividend after 59, then repeat: 594 / 815

Step 7:
594 divided by 815 is 0 with a remainder of 594.
The number 0 becomes the next digit in our result. 
Result so far: 5630.0
Subtracting 0 from 594 leaves us with 594.
Bring next digit (1) of the dividend behind the 594 and repeat the process: 5941 / 815

Step 8:
815 can be fit into 5941 7 times, resulting in a remainder of 236.
Use 7 as the next digit of our solution. 
Result so far: 56307.0
Subtracting 5705 from 5941 leaves us with 236.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2360, and continue the process.

Going ahead to step 9:
815 goes into 2360 2 times with a remainder of 730.
The next digit of our result is 2. 
Result so far: 56307.2
Deduct 1630 from 2360 and we're left with 730.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7300, and continue the process.

Advancing to step 10:
815 can be fit into 7300 8 times, resulting in a remainder of 780.
The number 8 becomes the next digit in our result. 
Result so far: 56307.28
If we subtract 6520 from 7300, we get 780.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7800, and continue the process.

Advancing to step 11:
The number 815 fits into 7800 9 times, leaving a remainder of 465.
Put 9 as the next digit of the answer. 
Result so far: 56307.289
Subtracting 7335 from 7800 leaves us with 465.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4650, and continue the process.

On to step 12:
4650 divided by 815 is 5 with a remainder of 575.
The next digit of our result is 5. 
Result so far: 56307.2895
The remainder is 575 after subtracting 4075 from 4650.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5750, and continue the process.

Step 13:
If we divide 5750 by 815, we get 7 and a remainder of 45.
The number 7 becomes the next digit in our result. 
Result so far: 56307.28957
Subtracting 5705 from 5750 leaves us with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

On to step 14:
If we divide 450 by 815, we get 0 and a remainder of 450.
Put 0 as the next digit of the answer. 
Result so far: 56307.28957
Subtract 0 from 450 to get 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4500, and continue the process.

On to step 15:
The number 815 fits into 4500 5 times, leaving a remainder of 425.
Use 5 as the next digit of our solution. 
Result so far: 56307.2895705
If we subtract 4075 from 4500, we get 425.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4250, and continue the process.

Going ahead to step 16:
When dividing 4250 by 815, we get 5 with a remainder of 175.
The next digit of our result is 5. 
Result so far: 56307.28957055
Subtract 4075 from 4250 to get 175.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1750, and continue the process.

The final result is 56307.28957055 with a remainder of 1.75e-07.