We look at the division of 8531584 by 818 
The aim is to understand the frequency of 818 in 8531584.

On to step 1:
When dividing 8 by 818, we get 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Bring next digit (5) of the dividend behind the 8 and repeat the process: 85 / 818

Step 2:
818 can be fit into 85 0 times, resulting in a remainder of 85.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 85 after subtracting 0 from 85.
Append the next digit (3) from the dividend to 85 and continue with: 853 / 818

Let's proceed to step 3:
The number 818 fits into 853 1 times, leaving a remainder of 35.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 818 from 853, we get 35.
Fetch the next digit (1) from the dividend, attach it to 35 and continue: 351 / 818

On to step 4:
351 divided by 818 is 0 with a remainder of 351.
The next digit of our result is 0. 
Result so far: 10.0
If we subtract 0 from 351, we get 351.
Include the next digit (5) from the dividend after 351, then repeat: 3515 / 818

Moving on to step 5:
The number 818 fits into 3515 4 times, leaving a remainder of 243.
The number 4 becomes the next digit in our result. 
Result so far: 104.0
Subtracting 3272 from 3515 leaves us with 243.
Include the next digit (8) from the dividend after 243, then repeat: 2438 / 818

Step 6:
If we divide 2438 by 818, we get 2 and a remainder of 802.
Put 2 as the next digit of the answer. 
Result so far: 1042.0
Subtracting 1636 from 2438 leaves us with 802.
Grab the next digit (4) from the dividend, add it to 802, then carry on: 8024 / 818

Let's proceed to step 7:
818 can be fit into 8024 9 times, resulting in a remainder of 662.
Record the quotient 9 as the next digit in the result. 
Result so far: 10429.0
If we subtract 7362 from 8024, we get 662.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6620, and continue the process.

Moving on to step 8:
818 can be fit into 6620 8 times, resulting in a remainder of 76.
Record the quotient 8 as the next digit in the result. 
Result so far: 10429.8
Deduct 6544 from 6620 and we're left with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Moving on to step 9:
818 can be fit into 760 0 times, resulting in a remainder of 760.
Write down 0 as next digit of the result. 
Result so far: 10429.8
Deduct 0 from 760 and we're left with 760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7600, and continue the process.

On to step 10:
818 goes into 7600 9 times with a remainder of 238.
The next digit of our result is 9. 
Result so far: 10429.809
The remainder is 238 after subtracting 7362 from 7600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2380, and continue the process.

Let's proceed to step 11:
When dividing 2380 by 818, we get 2 with a remainder of 744.
Use 2 as the next digit of our solution. 
Result so far: 10429.8092
If we take 1636 away from 2380, we end up with 744.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7440, and continue the process.

Going ahead to step 12:
If we divide 7440 by 818, we get 9 and a remainder of 78.
The next digit of our result is 9. 
Result so far: 10429.80929
Subtracting 7362 from 7440 leaves us with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Let's proceed to step 13:
780 divided by 818 is 0 with a remainder of 780.
Record the quotient 0 as the next digit in the result. 
Result so far: 10429.80929
If we take 0 away from 780, we end up with 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 14:
When dividing 7800 by 818, we get 9 with a remainder of 438.
Put 9 as the next digit of the answer. 
Result so far: 10429.8092909
The remainder is 438 after subtracting 7362 from 7800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4380, and continue the process.

Let's proceed to step 15:
818 goes into 4380 5 times with a remainder of 290.
Record the quotient 5 as the next digit in the result. 
Result so far: 10429.80929095
If we take 4090 away from 4380, we end up with 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

The final outcome is 10429.80929095, with a leftover of 2.9e-07.