We look at the division of 86665648 by 3 
The aim is to understand the frequency of 3 in 86665648.

Step 1:
3 goes into 8 2 times with a remainder of 2.
The next digit of our result is 2. 
Result so far: 2.0
Subtracting 6 from 8 leaves us with 2.
Grab the next digit (6) from the dividend, add it to 2, then carry on: 26 / 3

On to step 2:
3 goes into 26 8 times with a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 28.0
Subtract 24 from 26 to get 2.
Grab the next digit (6) from the dividend, add it to 2, then carry on: 26 / 3

Step 3:
3 goes into 26 8 times with a remainder of 2.
The next digit of our result is 8. 
Result so far: 288.0
Subtracting 24 from 26 leaves us with 2.
Fetch the next digit (6) from the dividend, attach it to 2 and continue: 26 / 3

Step 4:
If we divide 26 by 3, we get 8 and a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 2888.0
The remainder is 2 after subtracting 24 from 26.
Fetch the next digit (5) from the dividend, attach it to 2 and continue: 25 / 3

Step 5:
The number 3 fits into 25 8 times, leaving a remainder of 1.
Record the quotient 8 as the next digit in the result. 
Result so far: 28888.0
If we subtract 24 from 25, we get 1.
Fetch the next digit (6) from the dividend, attach it to 1 and continue: 16 / 3

Going ahead to step 6:
3 can be fit into 16 5 times, resulting in a remainder of 1.
Record the quotient 5 as the next digit in the result. 
Result so far: 288885.0
If we take 15 away from 16, we end up with 1.
Append the next digit (4) from the dividend to 1 and continue with: 14 / 3

Going ahead to step 7:
The number 3 fits into 14 4 times, leaving a remainder of 2.
Write down 4 as next digit of the result. 
Result so far: 2888854.0
Deduct 12 from 14 and we're left with 2.
Include the next digit (8) from the dividend after 2, then repeat: 28 / 3

Let's proceed to step 8:
28 divided by 3 is 9 with a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 28888549.0
The remainder is 1 after subtracting 27 from 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 9:
3 can be fit into 10 3 times, resulting in a remainder of 1.
Use 3 as the next digit of our solution. 
Result so far: 28888549.3
Deduct 9 from 10 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 10:
If we divide 10 by 3, we get 3 and a remainder of 1.
Record the quotient 3 as the next digit in the result. 
Result so far: 28888549.33
Subtract 9 from 10 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

After the division, we end up with 28888549.33 and a remainder of 0.001.