Let's divide 991456 by 66
The aim is to understand the frequency of 66 in 991456.

On to step 1:
66 can be fit into 9 0 times, resulting in a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Bring next digit (9) of the dividend behind the 9 and repeat the process: 99 / 66

Step 2:
99 divided by 66 is 1 with a remainder of 33.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 66 from 99 to get 33.
Take the next digit (1) from the dividend and append it to 33, then repeat: 331 / 66

Step 3:
If we divide 331 by 66, we get 5 and a remainder of 1.
Write down 5 as next digit of the result. 
Result so far: 15.0
Deduct 330 from 331 and we're left with 1.
Fetch the next digit (4) from the dividend, attach it to 1 and continue: 14 / 66

On to step 4:
When dividing 14 by 66, we get 0 with a remainder of 14.
Use 0 as the next digit of our solution. 
Result so far: 150.0
Deduct 0 from 14 and we're left with 14.
Append the next digit (5) from the dividend to 14 and continue with: 145 / 66

Advancing to step 5:
66 goes into 145 2 times with a remainder of 13.
The next digit of our result is 2. 
Result so far: 1502.0
If we subtract 132 from 145, we get 13.
Include the next digit (6) from the dividend after 13, then repeat: 136 / 66

Advancing to step 6:
66 goes into 136 2 times with a remainder of 4.
Use 2 as the next digit of our solution. 
Result so far: 15022.0
Subtract 132 from 136 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 7:
When dividing 40 by 66, we get 0 with a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 15022.0
The remainder is 40 after subtracting 0 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 8:
66 can be fit into 400 6 times, resulting in a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 15022.06
Subtracting 396 from 400 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 9:
66 can be fit into 40 0 times, resulting in a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 15022.06
If we subtract 0 from 40, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 10:
66 goes into 400 6 times with a remainder of 4.
The next digit of our result is 6. 
Result so far: 15022.0606
The remainder is 4 after subtracting 396 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 11:
66 can be fit into 40 0 times, resulting in a remainder of 40.
Use 0 as the next digit of our solution. 
Result so far: 15022.0606
Subtract 0 from 40 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 12:
The number 66 fits into 400 6 times, leaving a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 15022.060606
Subtracting 396 from 400 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 13:
66 can be fit into 40 0 times, resulting in a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 15022.060606
If we subtract 0 from 40, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 14:
When dividing 400 by 66, we get 6 with a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 15022.06060606
Subtracting 396 from 400 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The final result is 15022.06060606 with a remainder of 4e-09.