3391 divided by 66 
The aim is to understand the frequency of 66 in 3391.

Moving on to step 1:
3 divided by 66 is 0 with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Bring next digit (3) of the dividend behind the 3 and repeat the process: 33 / 66

Going ahead to step 2:
33 divided by 66 is 0 with a remainder of 33.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 33 to get 33.
Fetch the next digit (9) from the dividend, attach it to 33 and continue: 339 / 66

Going ahead to step 3:
When dividing 339 by 66, we get 5 with a remainder of 9.
The next digit of our result is 5. 
Result so far: 5.0
If we take 330 away from 339, we end up with 9.
Fetch the next digit (1) from the dividend, attach it to 9 and continue: 91 / 66

Going ahead to step 4:
The number 66 fits into 91 1 times, leaving a remainder of 25.
The next digit of our result is 1. 
Result so far: 51.0
Deduct 66 from 91 and we're left with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Let's proceed to step 5:
66 goes into 250 3 times with a remainder of 52.
The next digit of our result is 3. 
Result so far: 51.3
The remainder is 52 after subtracting 198 from 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Let's proceed to step 6:
When dividing 520 by 66, we get 7 with a remainder of 58.
The next digit of our result is 7. 
Result so far: 51.37
If we take 462 away from 520, we end up with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Step 7:
The number 66 fits into 580 8 times, leaving a remainder of 52.
Use 8 as the next digit of our solution. 
Result so far: 51.378
If we take 528 away from 580, we end up with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Let's proceed to step 8:
When dividing 520 by 66, we get 7 with a remainder of 58.
Record the quotient 7 as the next digit in the result. 
Result so far: 51.3787
If we take 462 away from 520, we end up with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Advancing to step 9:
66 goes into 580 8 times with a remainder of 52.
Use 8 as the next digit of our solution. 
Result so far: 51.37878
Deduct 528 from 580 and we're left with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Going ahead to step 10:
520 divided by 66 is 7 with a remainder of 58.
Write down 7 as next digit of the result. 
Result so far: 51.378787
If we take 462 away from 520, we end up with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

On to step 11:
66 can be fit into 580 8 times, resulting in a remainder of 52.
The next digit of our result is 8. 
Result so far: 51.3787878
Subtract 528 from 580 to get 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Let's proceed to step 12:
The number 66 fits into 520 7 times, leaving a remainder of 58.
Record the quotient 7 as the next digit in the result. 
Result so far: 51.37878787
If we take 462 away from 520, we end up with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

After the division, we end up with 51.37878787 and a remainder of 5.8e-08.