We look at the division of 853878 by 78 
The aim is to understand the frequency of 78 in 853878.

On to step 1:
When dividing 8 by 78, we get 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Bring next digit (5) of the dividend behind the 8 and repeat the process: 85 / 78

Let's proceed to step 2:
78 can be fit into 85 1 times, resulting in a remainder of 7.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 78 from 85 to get 7.
Fetch the next digit (3) from the dividend, attach it to 7 and continue: 73 / 78

Advancing to step 3:
78 goes into 73 0 times with a remainder of 73.
Put 0 as the next digit of the answer. 
Result so far: 10.0
Subtracting 0 from 73 leaves us with 73.
Append the next digit (8) from the dividend to 73 and continue with: 738 / 78

Advancing to step 4:
When dividing 738 by 78, we get 9 with a remainder of 36.
Write down 9 as next digit of the result. 
Result so far: 109.0
If we take 702 away from 738, we end up with 36.
Fetch the next digit (7) from the dividend, attach it to 36 and continue: 367 / 78

Moving on to step 5:
367 divided by 78 is 4 with a remainder of 55.
Put 4 as the next digit of the answer. 
Result so far: 1094.0
Deduct 312 from 367 and we're left with 55.
Include the next digit (8) from the dividend after 55, then repeat: 558 / 78

Step 6:
When dividing 558 by 78, we get 7 with a remainder of 12.
Write down 7 as next digit of the result. 
Result so far: 10947.0
Deduct 546 from 558 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 7:
78 goes into 120 1 times with a remainder of 42.
Use 1 as the next digit of our solution. 
Result so far: 10947.1
If we take 78 away from 120, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 8:
When dividing 420 by 78, we get 5 with a remainder of 30.
The number 5 becomes the next digit in our result. 
Result so far: 10947.15
If we take 390 away from 420, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 9:
300 divided by 78 is 3 with a remainder of 66.
Write down 3 as next digit of the result. 
Result so far: 10947.153
If we take 234 away from 300, we end up 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.

Let's proceed to step 10:
78 can be fit into 660 8 times, resulting in a remainder of 36.
Put 8 as the next digit of the answer. 
Result so far: 10947.1538
Subtract 624 from 660 to 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.

Going ahead to step 11:
The number 78 fits into 360 4 times, leaving a remainder of 48.
Use 4 as the next digit of our solution. 
Result so far: 10947.15384
If we take 312 away from 360, we end up with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Moving on to step 12:
If we divide 480 by 78, we get 6 and a remainder of 12.
Use 6 as the next digit of our solution. 
Result so far: 10947.153846
If we take 468 away from 480, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 13:
When dividing 120 by 78, we get 1 with a remainder of 42.
Put 1 as the next digit of the answer. 
Result so far: 10947.1538461
If we subtract 78 from 120, we get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Let's proceed to step 14:
When dividing 420 by 78, we get 5 with a remainder of 30.
Use 5 as the next digit of our solution. 
Result so far: 10947.15384615
The remainder is 30 after subtracting 390 from 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

After the division, we end up with 10947.15384615 and a remainder of 3e-08.