Let's divide 516291 by 66
The aim is to understand the frequency of 66 in 516291.

On to step 1:
The number 66 fits into 5 0 times, leaving a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Fetch the next digit (1) from the dividend, attach it to 5 and continue: 51 / 66

On to step 2:
If we divide 51 by 66, we get 0 and a remainder of 51.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 51, we end up with 51.
Fetch the next digit (6) from the dividend, attach it to 51 and continue: 516 / 66

Advancing to step 3:
516 divided by 66 is 7 with a remainder of 54.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
Deduct 462 from 516 and we're left with 54.
Bring next digit (2) of the dividend behind the 54 and repeat the process: 542 / 66

Let's proceed to step 4:
542 divided by 66 is 8 with a remainder of 14.
Put 8 as the next digit of the answer. 
Result so far: 78.0
Deduct 528 from 542 and we're left with 14.
Include the next digit (9) from the dividend after 14, then repeat: 149 / 66

Advancing to step 5:
If we divide 149 by 66, we get 2 and a remainder of 17.
Record the quotient 2 as the next digit in the result. 
Result so far: 782.0
Subtract 132 from 149 to get 17.
Append the next digit (1) from the dividend to 17 and continue with: 171 / 66

Let's proceed to step 6:
171 divided by 66 is 2 with a remainder of 39.
The next digit of our result is 2. 
Result so far: 7822.0
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.

Advancing to step 7:
66 goes into 390 5 times with a remainder of 60.
Use 5 as the next digit of our solution. 
Result so far: 7822.5
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.

Advancing to step 8:
66 can be fit into 600 9 times, resulting in a remainder of 6.
The next digit of our result is 9. 
Result so far: 7822.59
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.

Step 9:
When dividing 60 by 66, we get 0 with a remainder of 60.
Use 0 as the next digit of our solution. 
Result so far: 7822.59
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.

On to step 10:
When dividing 600 by 66, we get 9 with a remainder of 6.
Use 9 as the next digit of our solution. 
Result so far: 7822.5909
If we take 594 away from 600, we end up 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.

Step 11:
The number 66 fits into 60 0 times, leaving a remainder of 60.
The number 0 becomes the next digit in our result. 
Result so far: 7822.5909
Subtracting 0 from 60 leaves us 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 12:
The number 66 fits into 600 9 times, leaving a remainder of 6.
The next digit of our result is 9. 
Result so far: 7822.590909
If we subtract 594 from 600, we 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.

On to step 13:
60 divided by 66 is 0 with a remainder of 60.
The next digit of our result is 0. 
Result so far: 7822.590909
If we subtract 0 from 60, we 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.

Going ahead to step 14:
If we divide 600 by 66, we get 9 and a remainder of 6.
Write down 9 as next digit of the result. 
Result so far: 7822.59090909
If we take 594 away from 600, we end up 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.

After the division, we end up with 7822.59090909 and a remainder of 6e-09.