We look at the division of 31308453 by 86 
The aim is to understand the frequency of 86 in 31308453.

Going ahead to step 1:
86 goes into 3 0 times with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Include the next digit (1) from the dividend after 3, then repeat: 31 / 86

Step 2:
The number 86 fits into 31 0 times, leaving a remainder of 31.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 31, we end up with 31.
Grab the next digit (3) from the dividend, add it to 31, then carry on: 313 / 86

Let's proceed to step 3:
The number 86 fits into 313 3 times, leaving a remainder of 55.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Deduct 258 from 313 and we're left with 55.
Append the next digit (0) from the dividend to 55 and continue with: 550 / 86

Moving on to step 4:
550 divided by 86 is 6 with a remainder of 34.
Record the quotient 6 as the next digit in the result. 
Result so far: 36.0
Deduct 516 from 550 and we're left with 34.
Take the next digit (8) from the dividend and append it to 34, then repeat: 348 / 86

On to step 5:
86 can be fit into 348 4 times, resulting in a remainder of 4.
Use 4 as the next digit of our solution. 
Result so far: 364.0
Subtracting 344 from 348 leaves us with 4.
Take the next digit (4) from the dividend and append it to 4, then repeat: 44 / 86

Going ahead to step 6:
44 divided by 86 is 0 with a remainder of 44.
Use 0 as the next digit of our solution. 
Result so far: 3640.0
Subtracting 0 from 44 leaves us with 44.
Fetch the next digit (5) from the dividend, attach it to 44 and continue: 445 / 86

Going ahead to step 7:
445 divided by 86 is 5 with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 36405.0
The remainder is 15 after subtracting 430 from 445.
Include the next digit (3) from the dividend after 15, then repeat: 153 / 86

Going ahead to step 8:
The number 86 fits into 153 1 times, leaving a remainder of 67.
Write down 1 as next digit of the result. 
Result so far: 364051.0
Deduct 86 from 153 and we're left with 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

On to step 9:
86 can be fit into 670 7 times, resulting in a remainder of 68.
The number 7 becomes the next digit in our result. 
Result so far: 364051.7
Deduct 602 from 670 and we're left with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Moving on to step 10:
86 goes into 680 7 times with a remainder of 78.
Record the quotient 7 as the next digit in the result. 
Result so far: 364051.77
Subtracting 602 from 680 leaves us with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

In conclusion, the division gives 364051.77 with a balance of 0.078.