290666 ÷ 66 
The aim is to understand the frequency of 66 in 290666.

On to step 1:
66 goes into 2 0 times with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Bring next digit (9) of the dividend behind the 2 and repeat the process: 29 / 66

Let's proceed to step 2:
66 goes into 29 0 times with a remainder of 29.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 29 and we're left with 29.
Fetch the next digit (0) from the dividend, attach it to 29 and continue: 290 / 66

Step 3:
66 can be fit into 290 4 times, resulting in a remainder of 26.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
The remainder is 26 after subtracting 264 from 290.
Append the next digit (6) from the dividend to 26 and continue with: 266 / 66

Step 4:
66 goes into 266 4 times with a remainder of 2.
The number 4 becomes the next digit in our result. 
Result so far: 44.0
If we subtract 264 from 266, we get 2.
Fetch the next digit (6) from the dividend, attach it to 2 and continue: 26 / 66

Moving on to step 5:
The number 66 fits into 26 0 times, leaving a remainder of 26.
The number 0 becomes the next digit in our result. 
Result so far: 440.0
Subtract 0 from 26 to get 26.
Bring next digit (6) of the dividend behind the 26 and repeat the process: 266 / 66

On to step 6:
The number 66 fits into 266 4 times, leaving a remainder of 2.
Record the quotient 4 as the next digit in the result. 
Result so far: 4404.0
Subtracting 264 from 266 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 7:
The number 66 fits into 20 0 times, leaving a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 4404.0
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 8:
The number 66 fits into 200 3 times, leaving a remainder of 2.
The number 3 becomes the next digit in our result. 
Result so far: 4404.03
Subtracting 198 from 200 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 9:
The number 66 fits into 20 0 times, leaving a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 4404.03
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 10:
When dividing 200 by 66, we get 3 with a remainder of 2.
Write down 3 as next digit of the result. 
Result so far: 4404.0303
If we take 198 away from 200, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 11:
If we divide 20 by 66, we get 0 and a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 4404.0303
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 12:
The number 66 fits into 200 3 times, leaving a remainder of 2.
Write down 3 as next digit of the result. 
Result so far: 4404.030303
If we subtract 198 from 200, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 13:
66 goes into 20 0 times with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 4404.030303
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 14:
The number 66 fits into 200 3 times, leaving a remainder of 2.
Use 3 as the next digit of our solution. 
Result so far: 4404.03030303
If we take 198 away from 200, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

After the division, we end up with 4404.03030303 and a remainder of 2e-09.