389625 divided by 78 
The aim is to understand the frequency of 78 in 389625.

Moving on to step 1:
If we divide 3 by 78, we get 0 and a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Fetch the next digit (8) from the dividend, attach it to 3 and continue: 38 / 78

Let's proceed to step 2:
When dividing 38 by 78, we get 0 with a remainder of 38.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 38 to get 38.
Fetch the next digit (9) from the dividend, attach it to 38 and continue: 389 / 78

On to step 3:
The number 78 fits into 389 4 times, leaving a remainder of 77.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtract 312 from 389 to get 77.
Grab the next digit (6) from the dividend, add it to 77, then carry on: 776 / 78

Moving on to step 4:
The number 78 fits into 776 9 times, leaving a remainder of 74.
The number 9 becomes the next digit in our result. 
Result so far: 49.0
The remainder is 74 after subtracting 702 from 776.
Append the next digit (2) from the dividend to 74 and continue with: 742 / 78

On to step 5:
742 divided by 78 is 9 with a remainder of 40.
Put 9 as the next digit of the answer. 
Result so far: 499.0
Subtracting 702 from 742 leaves us with 40.
Grab the next digit (5) from the dividend, add it to 40, then carry on: 405 / 78

Advancing to step 6:
78 can be fit into 405 5 times, resulting in a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 4995.0
If we subtract 390 from 405, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 7:
78 can be fit into 150 1 times, resulting in a remainder of 72.
The number 1 becomes the next digit in our result. 
Result so far: 4995.1
Deduct 78 from 150 and we're left 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.

Going ahead to step 8:
78 can be fit into 720 9 times, resulting in a remainder of 18.
Write down 9 as next digit of the result. 
Result so far: 4995.19
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.

Going ahead to step 9:
When dividing 180 by 78, we get 2 with a remainder of 24.
Record the quotient 2 as the next digit in the result. 
Result so far: 4995.192
Deduct 156 from 180 and we're left 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.

Going ahead to step 10:
78 can be fit into 240 3 times, resulting in a remainder of 6.
The number 3 becomes the next digit in our result. 
Result so far: 4995.1923
Deduct 234 from 240 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 11:
78 goes into 60 0 times with a remainder of 60.
The number 0 becomes the next digit in our result. 
Result so far: 4995.1923
Subtracting 0 from 60 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 12:
78 can be fit into 600 7 times, resulting in a remainder of 54.
Record the quotient 7 as the next digit in the result. 
Result so far: 4995.192307
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.

Advancing to step 13:
The number 78 fits into 540 6 times, leaving a remainder of 72.
The next digit of our result is 6. 
Result so far: 4995.1923076
If we subtract 468 from 540, we 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.

On to step 14:
78 can be fit into 720 9 times, resulting in a remainder of 18.
Put 9 as the next digit of the answer. 
Result so far: 4995.19230769
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.

The final result is 4995.19230769 with a remainder of 1.8e-08.