We look at the division of 417951 by 66 
The aim is to understand the frequency of 66 in 417951.

Advancing to step 1:
66 goes into 4 0 times with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Append the next digit (1) from the dividend to 4 and continue with: 41 / 66

Advancing to step 2:
66 can be fit into 41 0 times, resulting in a remainder of 41.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 41 to get 41.
Take the next digit (7) from the dividend and append it to 41, then repeat: 417 / 66

Step 3:
66 can be fit into 417 6 times, resulting in a remainder of 21.
Write down 6 as next digit of the result. 
Result so far: 6.0
Deduct 396 from 417 and we're left with 21.
Include the next digit (9) from the dividend after 21, then repeat: 219 / 66

Advancing to step 4:
66 goes into 219 3 times with a remainder of 21.
Use 3 as the next digit of our solution. 
Result so far: 63.0
If we subtract 198 from 219, we get 21.
Grab the next digit (5) from the dividend, add it to 21, then carry on: 215 / 66

On to step 5:
The number 66 fits into 215 3 times, leaving a remainder of 17.
The next digit of our result is 3. 
Result so far: 633.0
Subtract 198 from 215 to get 17.
Bring next digit (1) of the dividend behind the 17 and repeat the process: 171 / 66

Going ahead to step 6:
66 goes into 171 2 times with a remainder of 39.
Put 2 as the next digit of the answer. 
Result so far: 6332.0
If we subtract 132 from 171, we get 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

On to step 7:
The number 66 fits into 390 5 times, leaving a remainder of 60.
Put 5 as the next digit of the answer. 
Result so far: 6332.5
If we take 330 away from 390, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 8:
If we divide 600 by 66, we get 9 and a remainder of 6.
The next digit of our result is 9. 
Result so far: 6332.59
Deduct 594 from 600 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 9:
The number 66 fits into 60 0 times, leaving a remainder of 60.
The next digit of our result is 0. 
Result so far: 6332.59
If we take 0 away from 60, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 10:
When dividing 600 by 66, we get 9 with a remainder of 6.
The next digit of our result is 9. 
Result so far: 6332.5909
Deduct 594 from 600 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 11:
66 goes into 60 0 times with a remainder of 60.
The next digit of our result is 0. 
Result so far: 6332.5909
Deduct 0 from 60 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Moving on to step 12:
600 divided by 66 is 9 with a remainder of 6.
The next digit of our result is 9. 
Result so far: 6332.590909
The remainder is 6 after subtracting 594 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 13:
When dividing 60 by 66, we get 0 with a remainder of 60.
Record the quotient 0 as the next digit in the result. 
Result so far: 6332.590909
Subtract 0 from 60 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 14:
The number 66 fits into 600 9 times, leaving a remainder of 6.
The number 9 becomes the next digit in our result. 
Result so far: 6332.59090909
Subtract 594 from 600 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

In conclusion, the division gives 6332.59090909 with a balance of 6e-09.