We look at the division of 306873 by 86 
The aim is to understand the frequency of 86 in 306873.

Advancing to step 1:
86 goes into 3 0 times with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Bring next digit (0) of the dividend behind the 3 and repeat the process: 30 / 86

Advancing to step 2:
When dividing 30 by 86, we get 0 with a remainder of 30.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 30, we get 30.
Bring next digit (6) of the dividend behind the 30 and repeat the process: 306 / 86

Moving on to step 3:
86 goes into 306 3 times with a remainder of 48.
Write down 3 as next digit of the result. 
Result so far: 3.0
If we subtract 258 from 306, we get 48.
Append the next digit (8) from the dividend to 48 and continue with: 488 / 86

On to step 4:
488 divided by 86 is 5 with a remainder of 58.
Record the quotient 5 as the next digit in the result. 
Result so far: 35.0
If we take 430 away from 488, we end up with 58.
Fetch the next digit (7) from the dividend, attach it to 58 and continue: 587 / 86

Moving on to step 5:
The number 86 fits into 587 6 times, leaving a remainder of 71.
Use 6 as the next digit of our solution. 
Result so far: 356.0
If we subtract 516 from 587, we get 71.
Append the next digit (3) from the dividend to 71 and continue with: 713 / 86

Let's proceed to step 6:
713 divided by 86 is 8 with a remainder of 25.
The next digit of our result is 8. 
Result so far: 3568.0
Subtracting 688 from 713 leaves us with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Advancing to step 7:
86 can be fit into 250 2 times, resulting in a remainder of 78.
Record the quotient 2 as the next digit in the result. 
Result so far: 3568.2
Subtract 172 from 250 to get 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Going ahead to step 8:
When dividing 780 by 86, we get 9 with a remainder of 6.
Write down 9 as next digit of the result. 
Result so far: 3568.29
If we subtract 774 from 780, we get 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 9:
If we divide 60 by 86, we get 0 and a remainder of 60.
Use 0 as the next digit of our solution. 
Result so far: 3568.29
If we take 0 away from 60, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 10:
600 divided by 86 is 6 with a remainder of 84.
Record the quotient 6 as the next digit in the result. 
Result so far: 3568.2906
Subtract 516 from 600 to get 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Advancing to step 11:
840 divided by 86 is 9 with a remainder of 66.
Record the quotient 9 as the next digit in the result. 
Result so far: 3568.29069
The remainder is 66 after subtracting 774 from 840.
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 12:
660 divided by 86 is 7 with a remainder of 58.
Record the quotient 7 as the next digit in the result. 
Result so far: 3568.290697
Subtracting 602 from 660 leaves us with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

On to step 13:
86 can be fit into 580 6 times, resulting in a remainder of 64.
Use 6 as the next digit of our solution. 
Result so far: 3568.2906976
Deduct 516 from 580 and we're left with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Advancing to step 14:
86 goes into 640 7 times with a remainder of 38.
The number 7 becomes the next digit in our result. 
Result so far: 3568.29069767
Deduct 602 from 640 and we're left with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Our division results in 3568.29069767 with a remaining 3.8e-08.