917040 ÷ 66 
The aim is to understand the frequency of 66 in 917040.

Step 1:
When dividing 9 by 66, we get 0 with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Take the next digit (1) from the dividend and append it to 9, then repeat: 91 / 66

Moving on to step 2:
66 can be fit into 91 1 times, resulting in a remainder of 25.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 66 from 91, we get 25.
Include the next digit (7) from the dividend after 25, then repeat: 257 / 66

Step 3:
66 goes into 257 3 times with a remainder of 59.
Record the quotient 3 as the next digit in the result. 
Result so far: 13.0
Subtract 198 from 257 to get 59.
Append the next digit (0) from the dividend to 59 and continue with: 590 / 66

Going ahead to step 4:
The number 66 fits into 590 8 times, leaving a remainder of 62.
The next digit of our result is 8. 
Result so far: 138.0
The remainder is 62 after subtracting 528 from 590.
Take the next digit (4) from the dividend and append it to 62, then repeat: 624 / 66

Going ahead to step 5:
624 divided by 66 is 9 with a remainder of 30.
The next digit of our result is 9. 
Result so far: 1389.0
Subtracting 594 from 624 leaves us with 30.
Include the next digit (0) from the dividend after 30, then repeat: 300 / 66

Advancing to step 6:
300 divided by 66 is 4 with a remainder of 36.
The number 4 becomes the next digit in our result. 
Result so far: 13894.0
If we take 264 away from 300, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Going ahead to step 7:
If we divide 360 by 66, we get 5 and a remainder of 30.
Use 5 as the next digit of our solution. 
Result so far: 13894.5
Deduct 330 from 360 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 8:
66 goes into 300 4 times with a remainder of 36.
Put 4 as the next digit of the answer. 
Result so far: 13894.54
Deduct 264 from 300 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Advancing to step 9:
The number 66 fits into 360 5 times, leaving a remainder of 30.
Record the quotient 5 as the next digit in the result. 
Result so far: 13894.545
Subtract 330 from 360 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 10:
When dividing 300 by 66, we get 4 with a remainder of 36.
Use 4 as the next digit of our solution. 
Result so far: 13894.5454
The remainder is 36 after subtracting 264 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 11:
66 goes into 360 5 times with a remainder of 30.
The number 5 becomes the next digit in our result. 
Result so far: 13894.54545
Deduct 330 from 360 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 12:
The number 66 fits into 300 4 times, leaving a remainder of 36.
Use 4 as the next digit of our solution. 
Result so far: 13894.545454
If we subtract 264 from 300, we get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 13:
When dividing 360 by 66, we get 5 with a remainder of 30.
Record the quotient 5 as the next digit in the result. 
Result so far: 13894.5454545
Subtract 330 from 360 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 14:
The number 66 fits into 300 4 times, leaving a remainder of 36.
Put 4 as the next digit of the answer. 
Result so far: 13894.54545454
If we take 264 away from 300, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

The final result is 13894.54545454 with a remainder of 3.6e-08.