We're dividing 66246717 by 678 
The aim is to understand the frequency of 678 in 66246717.

Step 1:
When dividing 6 by 678, we get 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 678

On to step 2:
If we divide 66 by 678, we get 0 and a remainder of 66.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 66 to get 66.
Bring next digit (2) of the dividend behind the 66 and repeat the process: 662 / 678

Let's proceed to step 3:
The number 678 fits into 662 0 times, leaving a remainder of 662.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 662 after subtracting 0 from 662.
Append the next digit (4) from the dividend to 662 and continue with: 6624 / 678

Going ahead to step 4:
When dividing 6624 by 678, we get 9 with a remainder of 522.
Write down 9 as next digit of the result. 
Result so far: 9.0
If we take 6102 away from 6624, we end up with 522.
Include the next digit (6) from the dividend after 522, then repeat: 5226 / 678

Let's proceed to step 5:
5226 divided by 678 is 7 with a remainder of 480.
The next digit of our result is 7. 
Result so far: 97.0
Deduct 4746 from 5226 and we're left with 480.
Append the next digit (7) from the dividend to 480 and continue with: 4807 / 678

Advancing to step 6:
678 goes into 4807 7 times with a remainder of 61.
The number 7 becomes the next digit in our result. 
Result so far: 977.0
Deduct 4746 from 4807 and we're left with 61.
Grab the next digit (1) from the dividend, add it to 61, then carry on: 611 / 678

Going ahead to step 7:
611 divided by 678 is 0 with a remainder of 611.
Put 0 as the next digit of the answer. 
Result so far: 9770.0
Subtracting 0 from 611 leaves us with 611.
Take the next digit (7) from the dividend and append it to 611, then repeat: 6117 / 678

Step 8:
6117 divided by 678 is 9 with a remainder of 15.
Use 9 as the next digit of our solution. 
Result so far: 97709.0
Subtracting 6102 from 6117 leaves us 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.

Let's proceed to step 9:
The number 678 fits into 150 0 times, leaving a remainder of 150.
Put 0 as the next digit of the answer. 
Result so far: 97709.0
If we subtract 0 from 150, we get 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Advancing to step 10:
When dividing 1500 by 678, we get 2 with a remainder of 144.
Use 2 as the next digit of our solution. 
Result so far: 97709.02
If we subtract 1356 from 1500, we get 144.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1440, and continue the process.

Going ahead to step 11:
678 goes into 1440 2 times with a remainder of 84.
Put 2 as the next digit of the answer. 
Result so far: 97709.022
Subtracting 1356 from 1440 leaves us with 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

The final result is 97709.022 with a remainder of 0.0084.