528635 divided by 66 
The aim is to understand the frequency of 66 in 528635.

Let's proceed to step 1:
66 goes into 5 0 times with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Append the next digit (2) from the dividend to 5 and continue with: 52 / 66

Moving on to step 2:
52 divided by 66 is 0 with a remainder of 52.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 52 after subtracting 0 from 52.
Grab the next digit (8) from the dividend, add it to 52, then carry on: 528 / 66

Let's proceed to step 3:
528 divided by 66 is 8 with a remainder of 0.
Use 8 as the next digit of our solution. 
Result so far: 8.0
Subtracting 528 from 528 leaves us with 0.
Include the next digit (6) from the dividend after 0, then repeat: 6 / 66

Going ahead to step 4:
The number 66 fits into 6 0 times, leaving a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 80.0
Subtracting 0 from 6 leaves us with 6.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 66

Going ahead to step 5:
When dividing 63 by 66, we get 0 with a remainder of 63.
The number 0 becomes the next digit in our result. 
Result so far: 800.0
Deduct 0 from 63 and we're left with 63.
Include the next digit (5) from the dividend after 63, then repeat: 635 / 66

Let's proceed to step 6:
When dividing 635 by 66, we get 9 with a remainder of 41.
The number 9 becomes the next digit in our result. 
Result so far: 8009.0
Subtract 594 from 635 to get 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Advancing to step 7:
The number 66 fits into 410 6 times, leaving a remainder of 14.
The number 6 becomes the next digit in our result. 
Result so far: 8009.6
If we subtract 396 from 410, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 8:
66 goes into 140 2 times with a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 8009.62
The remainder is 8 after subtracting 132 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 9:
80 divided by 66 is 1 with a remainder of 14.
Put 1 as the next digit of the answer. 
Result so far: 8009.621
Subtract 66 from 80 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 10:
66 goes into 140 2 times with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 8009.6212
Subtract 132 from 140 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 11:
If we divide 80 by 66, we get 1 and a remainder of 14.
The number 1 becomes the next digit in our result. 
Result so far: 8009.62121
If we take 66 away from 80, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 12:
140 divided by 66 is 2 with a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 8009.621212
Subtracting 132 from 140 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 13:
66 goes into 80 1 times with a remainder of 14.
Use 1 as the next digit of our solution. 
Result so far: 8009.6212121
Subtract 66 from 80 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 14:
When dividing 140 by 66, we get 2 with a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 8009.62121212
Subtract 132 from 140 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

After the division, we end up with 8009.62121212 and a remainder of 8e-09.