939965 ÷ 78 
The aim is to understand the frequency of 78 in 939965.

Advancing to step 1:
78 goes into 9 0 times with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Append the next digit (3) from the dividend to 9 and continue with: 93 / 78

On to step 2:
78 can be fit into 93 1 times, resulting in a remainder of 15.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 78 from 93 to get 15.
Append the next digit (9) from the dividend to 15 and continue with: 159 / 78

Let's proceed to step 3:
78 goes into 159 2 times with a remainder of 3.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Subtracting 156 from 159 leaves us with 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 78

Going ahead to step 4:
78 goes into 39 0 times with a remainder of 39.
Put 0 as the next digit of the answer. 
Result so far: 120.0
Subtracting 0 from 39 leaves us with 39.
Fetch the next digit (6) from the dividend, attach it to 39 and continue: 396 / 78

Going ahead to step 5:
The number 78 fits into 396 5 times, leaving a remainder of 6.
The next digit of our result is 5. 
Result so far: 1205.0
If we take 390 away from 396, we end up with 6.
Include the next digit (5) from the dividend after 6, then repeat: 65 / 78

Let's proceed to step 6:
If we divide 65 by 78, we get 0 and a remainder of 65.
The next digit of our result is 0. 
Result so far: 12050.0
Deduct 0 from 65 and we're left with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Advancing to step 7:
78 can be fit into 650 8 times, resulting in a remainder of 26.
The number 8 becomes the next digit in our result. 
Result so far: 12050.8
Subtract 624 from 650 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Step 8:
78 goes into 260 3 times with a remainder of 26.
Put 3 as the next digit of the answer. 
Result so far: 12050.83
The remainder is 26 after subtracting 234 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

On to step 9:
78 goes into 260 3 times with a remainder of 26.
Put 3 as the next digit of the answer. 
Result so far: 12050.833
Subtract 234 from 260 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

The final outcome is 12050.833, with a leftover of 0.0026.