We're dividing 841986 by 78 
The aim is to understand the frequency of 78 in 841986.

Let's proceed to step 1:
8 divided by 78 is 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Fetch the next digit (4) from the dividend, attach it to 8 and continue: 84 / 78

Going ahead to step 2:
78 goes into 84 1 times with a remainder of 6.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 78 from 84 leaves us with 6.
Grab the next digit (1) from the dividend, add it to 6, then carry on: 61 / 78

Let's proceed to step 3:
If we divide 61 by 78, we get 0 and a remainder of 61.
Use 0 as the next digit of our solution. 
Result so far: 10.0
Subtracting 0 from 61 leaves us with 61.
Fetch the next digit (9) from the dividend, attach it to 61 and continue: 619 / 78

Step 4:
619 divided by 78 is 7 with a remainder of 73.
Write down 7 as next digit of the result. 
Result so far: 107.0
If we subtract 546 from 619, we get 73.
Append the next digit (8) from the dividend to 73 and continue with: 738 / 78

Advancing to step 5:
78 can be fit into 738 9 times, resulting in a remainder of 36.
Use 9 as the next digit of our solution. 
Result so far: 1079.0
The remainder is 36 after subtracting 702 from 738.
Take the next digit (6) from the dividend and append it to 36, then repeat: 366 / 78

On to step 6:
78 can be fit into 366 4 times, resulting in a remainder of 54.
Record the quotient 4 as the next digit in the result. 
Result so far: 10794.0
If we subtract 312 from 366, we get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

On to step 7:
78 goes into 540 6 times with a remainder of 72.
The next digit of our result is 6. 
Result so far: 10794.6
Subtracting 468 from 540 leaves us 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.

Let's proceed to step 8:
If we divide 720 by 78, we get 9 and a remainder of 18.
Put 9 as the next digit of the answer. 
Result so far: 10794.69
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:
If we divide 180 by 78, we get 2 and a remainder of 24.
Record the quotient 2 as the next digit in the result. 
Result so far: 10794.692
If we take 156 away from 180, we end up 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.

Advancing to step 10:
When dividing 240 by 78, we get 3 with a remainder of 6.
Put 3 as the next digit of the answer. 
Result so far: 10794.6923
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.

Let's proceed to step 11:
78 goes into 60 0 times with a remainder of 60.
The next digit of our result is 0. 
Result so far: 10794.6923
The remainder is 60 after subtracting 0 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 12:
When dividing 600 by 78, we get 7 with a remainder of 54.
The next digit of our result is 7. 
Result so far: 10794.692307
The remainder is 54 after subtracting 546 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Let's proceed to step 13:
540 divided by 78 is 6 with a remainder of 72.
Write down 6 as next digit of the result. 
Result so far: 10794.6923076
The remainder is 72 after subtracting 468 from 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Step 14:
78 goes into 720 9 times with a remainder of 18.
Write down 9 as next digit of the result. 
Result so far: 10794.69230769
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 outcome is 10794.69230769, with a leftover of 1.8e-08.