75840472 divided by 815 
The aim is to understand the frequency of 815 in 75840472.

On to step 1:
When dividing 7 by 815, we get 0 with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Grab the next digit (5) from the dividend, add it to 7, then carry on: 75 / 815

Step 2:
When dividing 75 by 815, we get 0 with a remainder of 75.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 75 leaves us with 75.
Bring next digit (8) of the dividend behind the 75 and repeat the process: 758 / 815

Going ahead to step 3:
If we divide 758 by 815, we get 0 and a remainder of 758.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 758 and we're left with 758.
Fetch the next digit (4) from the dividend, attach it to 758 and continue: 7584 / 815

On to step 4:
When dividing 7584 by 815, we get 9 with a remainder of 249.
Put 9 as the next digit of the answer. 
Result so far: 9.0
Deduct 7335 from 7584 and we're left with 249.
Bring next digit (0) of the dividend behind the 249 and repeat the process: 2490 / 815

Going ahead to step 5:
815 can be fit into 2490 3 times, resulting in a remainder of 45.
Use 3 as the next digit of our solution. 
Result so far: 93.0
If we take 2445 away from 2490, we end up with 45.
Fetch the next digit (4) from the dividend, attach it to 45 and continue: 454 / 815

Going ahead to step 6:
If we divide 454 by 815, we get 0 and a remainder of 454.
The number 0 becomes the next digit in our result. 
Result so far: 930.0
Subtracting 0 from 454 leaves us with 454.
Fetch the next digit (7) from the dividend, attach it to 454 and continue: 4547 / 815

On to step 7:
815 goes into 4547 5 times with a remainder of 472.
The next digit of our result is 5. 
Result so far: 9305.0
Subtract 4075 from 4547 to get 472.
Bring next digit (2) of the dividend behind the 472 and repeat the process: 4722 / 815

Advancing to step 8:
The number 815 fits into 4722 5 times, leaving a remainder of 647.
Put 5 as the next digit of the answer. 
Result so far: 93055.0
Subtract 4075 from 4722 to get 647.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6470, and continue the process.

Going ahead to step 9:
If we divide 6470 by 815, we get 7 and a remainder of 765.
Record the quotient 7 as the next digit in the result. 
Result so far: 93055.7
Subtract 5705 from 6470 to get 765.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7650, and continue the process.

Moving on to step 10:
7650 divided by 815 is 9 with a remainder of 315.
Use 9 as the next digit of our solution. 
Result so far: 93055.79
The remainder is 315 after subtracting 7335 from 7650.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3150, and continue the process.

Let's proceed to step 11:
815 can be fit into 3150 3 times, resulting in a remainder of 705.
Put 3 as the next digit of the answer. 
Result so far: 93055.793
If we take 2445 away from 3150, we end up with 705.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7050, and continue the process.

Advancing to step 12:
815 goes into 7050 8 times with a remainder of 530.
The number 8 becomes the next digit in our result. 
Result so far: 93055.7938
Subtract 6520 from 7050 to get 530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5300, and continue the process.

On to step 13:
815 can be fit into 5300 6 times, resulting in a remainder of 410.
Write down 6 as next digit of the result. 
Result so far: 93055.79386
Deduct 4890 from 5300 and we're left with 410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4100, and continue the process.

Going ahead to step 14:
If we divide 4100 by 815, we get 5 and a remainder of 25.
The number 5 becomes the next digit in our result. 
Result so far: 93055.793865
The remainder is 25 after subtracting 4075 from 4100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Let's proceed to step 15:
250 divided by 815 is 0 with a remainder of 250.
The number 0 becomes the next digit in our result. 
Result so far: 93055.793865
If we subtract 0 from 250, we get 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

Going ahead to step 16:
The number 815 fits into 2500 3 times, leaving a remainder of 55.
Record the quotient 3 as the next digit in the result. 
Result so far: 93055.79386503
Subtract 2445 from 2500 to get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

The final outcome is 93055.79386503, with a leftover of 5.5e-08.