We're dividing 158196 by 66 
The aim is to understand the frequency of 66 in 158196.

Step 1:
1 divided by 66 is 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 66

Step 2:
66 can be fit into 15 0 times, resulting in a remainder of 15.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 15 to get 15.
Fetch the next digit (8) from the dividend, attach it to 15 and continue: 158 / 66

On to step 3:
66 goes into 158 2 times with a remainder of 26.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we subtract 132 from 158, we get 26.
Append the next digit (1) from the dividend to 26 and continue with: 261 / 66

Advancing to step 4:
66 can be fit into 261 3 times, resulting in a remainder of 63.
Write down 3 as next digit of the result. 
Result so far: 23.0
If we take 198 away from 261, we end up with 63.
Grab the next digit (9) from the dividend, add it to 63, then carry on: 639 / 66

Moving on to step 5:
The number 66 fits into 639 9 times, leaving a remainder of 45.
Put 9 as the next digit of the answer. 
Result so far: 239.0
Subtracting 594 from 639 leaves us with 45.
Include the next digit (6) from the dividend after 45, then repeat: 456 / 66

Moving on to step 6:
When dividing 456 by 66, we get 6 with a remainder of 60.
Record the quotient 6 as the next digit in the result. 
Result so far: 2396.0
If we take 396 away from 456, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 7:
600 divided by 66 is 9 with a remainder of 6.
The next digit of our result is 9. 
Result so far: 2396.9
If we subtract 594 from 600, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 8:
When dividing 60 by 66, we get 0 with a remainder of 60.
Put 0 as the next digit of the answer. 
Result so far: 2396.9
If we take 0 away from 60, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 9:
600 divided by 66 is 9 with a remainder of 6.
The number 9 becomes the next digit in our result. 
Result so far: 2396.909
The remainder is 6 after subtracting 594 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 10:
When dividing 60 by 66, we get 0 with a remainder of 60.
The next digit of our result is 0. 
Result so far: 2396.909
Subtract 0 from 60 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 11:
If we divide 600 by 66, we get 9 and a remainder of 6.
Record the quotient 9 as the next digit in the result. 
Result so far: 2396.90909
The remainder is 6 after subtracting 594 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 12:
66 can be fit into 60 0 times, resulting in a remainder of 60.
Record the quotient 0 as the next digit in the result. 
Result so far: 2396.90909
The remainder is 60 after subtracting 0 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 13:
If we divide 600 by 66, we get 9 and a remainder of 6.
Write down 9 as next digit of the result. 
Result so far: 2396.9090909
If we take 594 away from 600, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 14:
The number 66 fits into 60 0 times, leaving a remainder of 60.
Record the quotient 0 as the next digit in the result. 
Result so far: 2396.9090909
The remainder is 60 after subtracting 0 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

The final result is 2396.9090909 with a remainder of 6e-08.