We look at the division of 375171 by 78 
The aim is to understand the frequency of 78 in 375171.

Going ahead to step 1:
The number 78 fits into 3 0 times, leaving a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Take the next digit (7) from the dividend and append it to 3, then repeat: 37 / 78

Let's proceed to step 2:
If we divide 37 by 78, we get 0 and a remainder of 37.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 37 to get 37.
Include the next digit (5) from the dividend after 37, then repeat: 375 / 78

Going ahead to step 3:
The number 78 fits into 375 4 times, leaving a remainder of 63.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
If we subtract 312 from 375, we get 63.
Fetch the next digit (1) from the dividend, attach it to 63 and continue: 631 / 78

Going ahead to step 4:
If we divide 631 by 78, we get 8 and a remainder of 7.
Write down 8 as next digit of the result. 
Result so far: 48.0
The remainder is 7 after subtracting 624 from 631.
Fetch the next digit (7) from the dividend, attach it to 7 and continue: 77 / 78

Going ahead to step 5:
When dividing 77 by 78, we get 0 with a remainder of 77.
The number 0 becomes the next digit in our result. 
Result so far: 480.0
Subtract 0 from 77 to get 77.
Include the next digit (1) from the dividend after 77, then repeat: 771 / 78

Moving on to step 6:
771 divided by 78 is 9 with a remainder of 69.
The number 9 becomes the next digit in our result. 
Result so far: 4809.0
The remainder is 69 after subtracting 702 from 771.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Step 7:
78 goes into 690 8 times with a remainder of 66.
The number 8 becomes the next digit in our result. 
Result so far: 4809.8
Deduct 624 from 690 and we're left with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

On to step 8:
78 goes into 660 8 times with a remainder of 36.
Record the quotient 8 as the next digit in the result. 
Result so far: 4809.88
Deduct 624 from 660 and we're left with 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 4809.88 with a remaining 0.036.