637707 ÷ 66 
The aim is to understand the frequency of 66 in 637707.

Advancing to step 1:
66 can be fit into 6 0 times, resulting in a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Grab the next digit (3) from the dividend, add it to 6, then carry on: 63 / 66

Advancing to step 2:
When dividing 63 by 66, we get 0 with a remainder of 63.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 63 to get 63.
Take the next digit (7) from the dividend and append it to 63, then repeat: 637 / 66

Moving on to step 3:
66 goes into 637 9 times with a remainder of 43.
Use 9 as the next digit of our solution. 
Result so far: 9.0
Subtracting 594 from 637 leaves us with 43.
Append the next digit (7) from the dividend to 43 and continue with: 437 / 66

Going ahead to step 4:
The number 66 fits into 437 6 times, leaving a remainder of 41.
The next digit of our result is 6. 
Result so far: 96.0
Subtract 396 from 437 to get 41.
Take the next digit (0) from the dividend and append it to 41, then repeat: 410 / 66

On to step 5:
410 divided by 66 is 6 with a remainder of 14.
Put 6 as the next digit of the answer. 
Result so far: 966.0
If we subtract 396 from 410, we get 14.
Grab the next digit (7) from the dividend, add it to 14, then carry on: 147 / 66

Step 6:
66 goes into 147 2 times with a remainder of 15.
Write down 2 as next digit of the result. 
Result so far: 9662.0
If we take 132 away from 147, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 7:
66 can be fit into 150 2 times, resulting in a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 9662.2
If we take 132 away from 150, we end up with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 8:
180 divided by 66 is 2 with a remainder of 48.
Write down 2 as next digit of the result. 
Result so far: 9662.22
Subtracting 132 from 180 leaves us with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

The final outcome is 9662.22, with a leftover of 0.048.