668790 ÷ 78 
The aim is to understand the frequency of 78 in 668790.

Going ahead to step 1:
If we divide 6 by 78, we get 0 and a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 78

Let's proceed to step 2:
66 divided by 78 is 0 with a remainder of 66.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 66 and we're left with 66.
Bring next digit (8) of the dividend behind the 66 and repeat the process: 668 / 78

Moving on to step 3:
668 divided by 78 is 8 with a remainder of 44.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
If we take 624 away from 668, we end up with 44.
Take the next digit (7) from the dividend and append it to 44, then repeat: 447 / 78

Moving on to step 4:
If we divide 447 by 78, we get 5 and a remainder of 57.
The next digit of our result is 5. 
Result so far: 85.0
Deduct 390 from 447 and we're left with 57.
Grab the next digit (9) from the dividend, add it to 57, then carry on: 579 / 78

Going ahead to step 5:
When dividing 579 by 78, we get 7 with a remainder of 33.
Put 7 as the next digit of the answer. 
Result so far: 857.0
If we subtract 546 from 579, we get 33.
Bring next digit (0) of the dividend behind the 33 and repeat the process: 330 / 78

Let's proceed to step 6:
78 goes into 330 4 times with a remainder of 18.
The number 4 becomes the next digit in our result. 
Result so far: 8574.0
The remainder is 18 after subtracting 312 from 330.
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 7:
If we divide 180 by 78, we get 2 and a remainder of 24.
The number 2 becomes the next digit in our result. 
Result so far: 8574.2
If we take 156 away from 180, we end up with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 8:
78 can be fit into 240 3 times, resulting in a remainder of 6.
Write down 3 as next digit of the result. 
Result so far: 8574.23
Subtract 234 from 240 to 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 9:
The number 78 fits into 60 0 times, leaving a remainder of 60.
The next digit of our result is 0. 
Result so far: 8574.23
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.

Step 10:
78 goes into 600 7 times with a remainder of 54.
Use 7 as the next digit of our solution. 
Result so far: 8574.2307
If we take 546 away from 600, we end up 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.

Let's proceed to step 11:
78 goes into 540 6 times with a remainder of 72.
Use 6 as the next digit of our solution. 
Result so far: 8574.23076
Subtract 468 from 540 to get 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 12:
If we divide 720 by 78, we get 9 and a remainder of 18.
Record the quotient 9 as the next digit in the result. 
Result so far: 8574.230769
The remainder is 18 after subtracting 702 from 720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 13:
If we divide 180 by 78, we get 2 and a remainder of 24.
The next digit of our result is 2. 
Result so far: 8574.2307692
If we subtract 156 from 180, we 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.

Going ahead to step 14:
78 can be fit into 240 3 times, resulting in a remainder of 6.
Write down 3 as next digit of the result. 
Result so far: 8574.23076923
The remainder is 6 after subtracting 234 from 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

In conclusion, the division gives 8574.23076923 with a balance of 6e-09.