10065397 ÷ 66 
The aim is to understand the frequency of 66 in 10065397.

Moving on to step 1:
66 can be fit into 1 0 times, resulting in a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Fetch the next digit (0) from the dividend, attach it to 1 and continue: 10 / 66

Step 2:
When dividing 10 by 66, we get 0 with a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 10 after subtracting 0 from 10.
Grab the next digit (0) from the dividend, add it to 10, then carry on: 100 / 66

Advancing to step 3:
66 goes into 100 1 times with a remainder of 34.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 34 after subtracting 66 from 100.
Bring next digit (6) of the dividend behind the 34 and repeat the process: 346 / 66

Let's proceed to step 4:
When dividing 346 by 66, we get 5 with a remainder of 16.
Put 5 as the next digit of the answer. 
Result so far: 15.0
Subtracting 330 from 346 leaves us with 16.
Include the next digit (5) from the dividend after 16, then repeat: 165 / 66

Let's proceed to step 5:
66 goes into 165 2 times with a remainder of 33.
Record the quotient 2 as the next digit in the result. 
Result so far: 152.0
Deduct 132 from 165 and we're left with 33.
Take the next digit (3) from the dividend and append it to 33, then repeat: 333 / 66

On to step 6:
The number 66 fits into 333 5 times, leaving a remainder of 3.
The next digit of our result is 5. 
Result so far: 1525.0
The remainder is 3 after subtracting 330 from 333.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 66

Going ahead to step 7:
If we divide 39 by 66, we get 0 and a remainder of 39.
Use 0 as the next digit of our solution. 
Result so far: 15250.0
If we take 0 away from 39, we end up with 39.
Append the next digit (7) from the dividend to 39 and continue with: 397 / 66

Going ahead to step 8:
66 can be fit into 397 6 times, resulting in a remainder of 1.
Record the quotient 6 as the next digit in the result. 
Result so far: 152506.0
Subtract 396 from 397 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 9:
The number 66 fits into 10 0 times, leaving a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 152506.0
Subtract 0 from 10 to 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 10:
66 goes into 100 1 times with a remainder of 34.
Use 1 as the next digit of our solution. 
Result so far: 152506.01
Subtract 66 from 100 to 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.

Advancing to step 11:
If we divide 340 by 66, we get 5 and a remainder of 10.
Use 5 as the next digit of our solution. 
Result so far: 152506.015
If we take 330 away from 340, we end up 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.

Advancing to step 12:
If we divide 100 by 66, we get 1 and a remainder of 34.
Put 1 as the next digit of the answer. 
Result so far: 152506.0151
Subtracting 66 from 100 leaves us 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 13:
66 goes into 340 5 times with a remainder of 10.
Write down 5 as next digit of the result. 
Result so far: 152506.01515
Subtract 330 from 340 to 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.

Going ahead to step 14:
When dividing 100 by 66, we get 1 with a remainder of 34.
Record the quotient 1 as the next digit in the result. 
Result so far: 152506.015151
The remainder is 34 after subtracting 66 from 100.
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 15:
The number 66 fits into 340 5 times, leaving a remainder of 10.
The next digit of our result is 5. 
Result so far: 152506.0151515
If we take 330 away from 340, we end up 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 16:
If we divide 100 by 66, we get 1 and a remainder of 34.
The next digit of our result is 1. 
Result so far: 152506.01515151
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.

After the division, we end up with 152506.01515151 and a remainder of 3.4e-08.