660090 divided by 78 
The aim is to understand the frequency of 78 in 660090.

Step 1:
6 divided by 78 is 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 78

On to step 2:
The number 78 fits into 66 0 times, leaving a remainder of 66.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 66 after subtracting 0 from 66.
Take the next digit (0) from the dividend and append it to 66, then repeat: 660 / 78

Step 3:
78 goes into 660 8 times with a remainder of 36.
Put 8 as the next digit of the answer. 
Result so far: 8.0
Subtract 624 from 660 to get 36.
Fetch the next digit (0) from the dividend, attach it to 36 and continue: 360 / 78

On to step 4:
If we divide 360 by 78, we get 4 and a remainder of 48.
Record the quotient 4 as the next digit in the result. 
Result so far: 84.0
The remainder is 48 after subtracting 312 from 360.
Grab the next digit (9) from the dividend, add it to 48, then carry on: 489 / 78

Let's proceed to step 5:
489 divided by 78 is 6 with a remainder of 21.
Write down 6 as next digit of the result. 
Result so far: 846.0
If we take 468 away from 489, we end up with 21.
Append the next digit (0) from the dividend to 21 and continue with: 210 / 78

Moving on to step 6:
210 divided by 78 is 2 with a remainder of 54.
Write down 2 as next digit of the result. 
Result so far: 8462.0
If we subtract 156 from 210, we get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Advancing to step 7:
When dividing 540 by 78, we get 6 with a remainder of 72.
Write down 6 as next digit of the result. 
Result so far: 8462.6
If we take 468 away from 540, we end up with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Advancing to step 8:
720 divided by 78 is 9 with a remainder of 18.
Use 9 as the next digit of our solution. 
Result so far: 8462.69
If we take 702 away from 720, 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.

Let's proceed to step 9:
If we divide 180 by 78, we get 2 and a remainder of 24.
Use 2 as the next digit of our solution. 
Result so far: 8462.692
Subtract 156 from 180 to get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Moving on to step 10:
The number 78 fits into 240 3 times, leaving a remainder of 6.
Record the quotient 3 as the next digit in the result. 
Result so far: 8462.6923
If we subtract 234 from 240, 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.

Going ahead to step 11:
When dividing 60 by 78, we get 0 with a remainder of 60.
The number 0 becomes the next digit in our result. 
Result so far: 8462.6923
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.

Advancing to step 12:
78 can be fit into 600 7 times, resulting in a remainder of 54.
Write down 7 as next digit of the result. 
Result so far: 8462.692307
Deduct 546 from 600 and we're left with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Moving on to step 13:
78 goes into 540 6 times with a remainder of 72.
Write down 6 as next digit of the result. 
Result so far: 8462.6923076
Subtracting 468 from 540 leaves us with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Step 14:
The number 78 fits into 720 9 times, leaving a remainder of 18.
The next digit of our result is 9. 
Result so far: 8462.69230769
Subtracting 702 from 720 leaves us 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.

Our division results in 8462.69230769 with a remaining 1.8e-08.