We're dividing 639747 by 78 
The aim is to understand the frequency of 78 in 639747.

Let's proceed to step 1:
The number 78 fits into 6 0 times, leaving 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.
Grab the next digit (3) from the dividend, add it to 6, then carry on: 63 / 78

Step 2:
The number 78 fits into 63 0 times, leaving a remainder of 63.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 63 after subtracting 0 from 63.
Grab the next digit (9) from the dividend, add it to 63, then carry on: 639 / 78

Advancing to step 3:
The number 78 fits into 639 8 times, leaving a remainder of 15.
Put 8 as the next digit of the answer. 
Result so far: 8.0
If we take 624 away from 639, we end up with 15.
Take the next digit (7) from the dividend and append it to 15, then repeat: 157 / 78

Let's proceed to step 4:
78 can be fit into 157 2 times, resulting in a remainder of 1.
Record the quotient 2 as the next digit in the result. 
Result so far: 82.0
If we take 156 away from 157, we end up with 1.
Bring next digit (4) of the dividend behind the 1 and repeat the process: 14 / 78

Advancing to step 5:
If we divide 14 by 78, we get 0 and a remainder of 14.
The number 0 becomes the next digit in our result. 
Result so far: 820.0
Subtracting 0 from 14 leaves us with 14.
Bring next digit (7) of the dividend behind the 14 and repeat the process: 147 / 78

On to step 6:
If we divide 147 by 78, we get 1 and a remainder of 69.
Record the quotient 1 as the next digit in the result. 
Result so far: 8201.0
If we subtract 78 from 147, we get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Going ahead to step 7:
The number 78 fits into 690 8 times, leaving a remainder of 66.
Put 8 as the next digit of the answer. 
Result so far: 8201.8
If we subtract 624 from 690, we get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Going ahead to step 8:
78 can be fit into 660 8 times, resulting in a remainder of 36.
The number 8 becomes the next digit in our result. 
Result so far: 8201.88
If we subtract 624 from 660, we get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Our division results in 8201.88 with a remaining 0.036.