We look at the division of 346985 by 78 
The aim is to understand the frequency of 78 in 346985.

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
If we take 0 away from 3, we end up with 3.
Append the next digit (4) from the dividend to 3 and continue with: 34 / 78

Going ahead to step 2:
The number 78 fits into 34 0 times, leaving a remainder of 34.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 34, we end up with 34.
Bring next digit (6) of the dividend behind the 34 and repeat the process: 346 / 78

Let's proceed to step 3:
The number 78 fits into 346 4 times, leaving a remainder of 34.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Deduct 312 from 346 and we're left with 34.
Bring next digit (9) of the dividend behind the 34 and repeat the process: 349 / 78

Let's proceed to step 4:
78 goes into 349 4 times with a remainder of 37.
The next digit of our result is 4. 
Result so far: 44.0
Deduct 312 from 349 and we're left with 37.
Take the next digit (8) from the dividend and append it to 37, then repeat: 378 / 78

Advancing to step 5:
The number 78 fits into 378 4 times, leaving a remainder of 66.
The number 4 becomes the next digit in our result. 
Result so far: 444.0
Subtract 312 from 378 to get 66.
Append the next digit (5) from the dividend to 66 and continue with: 665 / 78

Moving on to step 6:
The number 78 fits into 665 8 times, leaving a remainder of 41.
Use 8 as the next digit of our solution. 
Result so far: 4448.0
If we take 624 away from 665, we end up with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Step 7:
The number 78 fits into 410 5 times, leaving a remainder of 20.
Record the quotient 5 as the next digit in the result. 
Result so far: 4448.5
Subtract 390 from 410 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 8:
78 can be fit into 200 2 times, resulting in a remainder of 44.
The next digit of our result is 2. 
Result so far: 4448.52
Subtract 156 from 200 to get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

On to step 9:
440 divided by 78 is 5 with a remainder of 50.
Put 5 as the next digit of the answer. 
Result so far: 4448.525
The remainder is 50 after subtracting 390 from 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

On to step 10:
78 can be fit into 500 6 times, resulting in a remainder of 32.
The next digit of our result is 6. 
Result so far: 4448.5256
Deduct 468 from 500 and we're left with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Going ahead to step 11:
78 goes into 320 4 times with a remainder of 8.
The number 4 becomes the next digit in our result. 
Result so far: 4448.52564
Subtracting 312 from 320 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 12:
If we divide 80 by 78, we get 1 and a remainder of 2.
Write down 1 as next digit of the result. 
Result so far: 4448.525641
Subtract 78 from 80 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 13:
If we divide 20 by 78, we get 0 and a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 4448.525641
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 14:
If we divide 200 by 78, we get 2 and a remainder of 44.
The next digit of our result is 2. 
Result so far: 4448.52564102
Subtracting 156 from 200 leaves us with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

The final outcome is 4448.52564102, with a leftover of 4.4e-08.