99595456 ÷ 66 
The aim is to understand the frequency of 66 in 99595456.

On to step 1:
If we divide 9 by 66, we get 0 and a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Bring next digit (9) of the dividend behind the 9 and repeat the process: 99 / 66

Advancing to step 2:
99 divided by 66 is 1 with a remainder of 33.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 66 from 99 to get 33.
Take the next digit (5) from the dividend and append it to 33, then repeat: 335 / 66

Moving on to step 3:
When dividing 335 by 66, we get 5 with a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 15.0
If we take 330 away from 335, we end up with 5.
Bring next digit (9) of the dividend behind the 5 and repeat the process: 59 / 66

On to step 4:
If we divide 59 by 66, we get 0 and a remainder of 59.
The next digit of our result is 0. 
Result so far: 150.0
Subtract 0 from 59 to get 59.
Bring next digit (5) of the dividend behind the 59 and repeat the process: 595 / 66

Moving on to step 5:
66 goes into 595 9 times with a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 1509.0
The remainder is 1 after subtracting 594 from 595.
Grab the next digit (4) from the dividend, add it to 1, then carry on: 14 / 66

On to step 6:
14 divided by 66 is 0 with a remainder of 14.
Write down 0 as next digit of the result. 
Result so far: 15090.0
Subtract 0 from 14 to get 14.
Include the next digit (5) from the dividend after 14, then repeat: 145 / 66

On to step 7:
66 can be fit into 145 2 times, resulting in a remainder of 13.
Use 2 as the next digit of our solution. 
Result so far: 150902.0
If we subtract 132 from 145, we get 13.
Grab the next digit (6) from the dividend, add it to 13, then carry on: 136 / 66

Let's proceed to step 8:
If we divide 136 by 66, we get 2 and a remainder of 4.
Put 2 as the next digit of the answer. 
Result so far: 1509022.0
The remainder is 4 after subtracting 132 from 136.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 9:
If we divide 40 by 66, we get 0 and a remainder of 40.
Use 0 as the next digit of our solution. 
Result so far: 1509022.0
The remainder is 40 after subtracting 0 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 10:
66 goes into 400 6 times with a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 1509022.06
Subtracting 396 from 400 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 11:
When dividing 40 by 66, we get 0 with a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 1509022.06
If we take 0 away from 40, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 12:
The number 66 fits into 400 6 times, leaving a remainder of 4.
The next digit of our result is 6. 
Result so far: 1509022.0606
If we subtract 396 from 400, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 13:
If we divide 40 by 66, we get 0 and a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 1509022.0606
The remainder is 40 after subtracting 0 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 14:
The number 66 fits into 400 6 times, leaving a remainder of 4.
The next digit of our result is 6. 
Result so far: 1509022.060606
Deduct 396 from 400 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 15:
If we divide 40 by 66, we get 0 and a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 1509022.060606
If we subtract 0 from 40, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 16:
The number 66 fits into 400 6 times, leaving a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 1509022.06060606
Subtracting 396 from 400 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The final result is 1509022.06060606 with a remainder of 4e-09.