We look at the division of 863380 by 66 
The aim is to understand the frequency of 66 in 863380.

Advancing to step 1:
66 goes into 8 0 times with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 66

Moving on to step 2:
86 divided by 66 is 1 with a remainder of 20.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 66 from 86 and we're left with 20.
Grab the next digit (3) from the dividend, add it to 20, then carry on: 203 / 66

Advancing to step 3:
66 goes into 203 3 times with a remainder of 5.
The number 3 becomes the next digit in our result. 
Result so far: 13.0
The remainder is 5 after subtracting 198 from 203.
Append the next digit (3) from the dividend to 5 and continue with: 53 / 66

Going ahead to step 4:
The number 66 fits into 53 0 times, leaving a remainder of 53.
Use 0 as the next digit of our solution. 
Result so far: 130.0
If we subtract 0 from 53, we get 53.
Take the next digit (8) from the dividend and append it to 53, then repeat: 538 / 66

Step 5:
When dividing 538 by 66, we get 8 with a remainder of 10.
Write down 8 as next digit of the result. 
Result so far: 1308.0
The remainder is 10 after subtracting 528 from 538.
Grab the next digit (0) from the dividend, add it to 10, then carry on: 100 / 66

On to step 6:
66 can be fit into 100 1 times, resulting in a remainder of 34.
The next digit of our result is 1. 
Result so far: 13081.0
If we subtract 66 from 100, we get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Let's proceed to step 7:
The number 66 fits into 340 5 times, leaving a remainder of 10.
Record the quotient 5 as the next digit in the result. 
Result so far: 13081.5
The remainder is 10 after subtracting 330 from 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 8:
If we divide 100 by 66, we get 1 and a remainder of 34.
The number 1 becomes the next digit in our result. 
Result so far: 13081.51
Deduct 66 from 100 and we're left with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Going ahead to step 9:
66 can be fit into 340 5 times, resulting in a remainder of 10.
Put 5 as the next digit of the answer. 
Result so far: 13081.515
If we subtract 330 from 340, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 10:
100 divided by 66 is 1 with a remainder of 34.
Put 1 as the next digit of the answer. 
Result so far: 13081.5151
If we subtract 66 from 100, we get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Going ahead to step 11:
If we divide 340 by 66, we get 5 and a remainder of 10.
Put 5 as the next digit of the answer. 
Result so far: 13081.51515
Deduct 330 from 340 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 12:
66 goes into 100 1 times with a remainder of 34.
Record the quotient 1 as the next digit in the result. 
Result so far: 13081.515151
Deduct 66 from 100 and we're left with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Moving on to step 13:
The number 66 fits into 340 5 times, leaving a remainder of 10.
Write down 5 as next digit of the result. 
Result so far: 13081.5151515
If we subtract 330 from 340, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 14:
66 goes into 100 1 times with a remainder of 34.
The number 1 becomes the next digit in our result. 
Result so far: 13081.51515151
If we take 66 away from 100, we end up with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

The quotient of the division is 13081.51515151, and the remainder is 3.4e-08.