We look at the division of 780360 by 86 
The aim is to understand the frequency of 86 in 780360.

Step 1:
If we divide 7 by 86, we get 0 and a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 86

Moving on to step 2:
When dividing 78 by 86, we get 0 with a remainder of 78.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 78, we get 78.
Grab the next digit (0) from the dividend, add it to 78, then carry on: 780 / 86

Advancing to step 3:
780 divided by 86 is 9 with a remainder of 6.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
If we subtract 774 from 780, we get 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 86

Going ahead to step 4:
63 divided by 86 is 0 with a remainder of 63.
Record the quotient 0 as the next digit in the result. 
Result so far: 90.0
Subtract 0 from 63 to get 63.
Append the next digit (6) from the dividend to 63 and continue with: 636 / 86

Advancing to step 5:
If we divide 636 by 86, we get 7 and a remainder of 34.
Put 7 as the next digit of the answer. 
Result so far: 907.0
If we take 602 away from 636, we end up with 34.
Include the next digit (0) from the dividend after 34, then repeat: 340 / 86

Going ahead to step 6:
If we divide 340 by 86, we get 3 and a remainder of 82.
Use 3 as the next digit of our solution. 
Result so far: 9073.0
If we take 258 away from 340, we end up with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Going ahead to step 7:
If we divide 820 by 86, we get 9 and a remainder of 46.
Write down 9 as next digit of the result. 
Result so far: 9073.9
Subtracting 774 from 820 leaves us with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

On to step 8:
460 divided by 86 is 5 with a remainder of 30.
The next digit of our result is 5. 
Result so far: 9073.95
Deduct 430 from 460 and we're left 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:
When dividing 300 by 86, we get 3 with a remainder of 42.
Put 3 as the next digit of the answer. 
Result so far: 9073.953
Subtracting 258 from 300 leaves us 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.

Moving on to step 10:
The number 86 fits into 420 4 times, leaving a remainder of 76.
Put 4 as the next digit of the answer. 
Result so far: 9073.9534
Subtracting 344 from 420 leaves us with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Going ahead to step 11:
86 goes into 760 8 times with a remainder of 72.
Write down 8 as next digit of the result. 
Result so far: 9073.95348
The remainder is 72 after subtracting 688 from 760.
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 12:
When dividing 720 by 86, we get 8 with a remainder of 32.
The number 8 becomes the next digit in our result. 
Result so far: 9073.953488
Deduct 688 from 720 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.

Our division results in 9073.953488 with a remaining 3.2e-06.