We look at the division of 253291 by 86 
The aim is to understand the frequency of 86 in 253291.

On to step 1:
When dividing 2 by 86, we get 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Include the next digit (5) from the dividend after 2, then repeat: 25 / 86

Moving on to step 2:
25 divided by 86 is 0 with a remainder of 25.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 25, we get 25.
Append the next digit (3) from the dividend to 25 and continue with: 253 / 86

Moving on to step 3:
253 divided by 86 is 2 with a remainder of 81.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we take 172 away from 253, we end up with 81.
Append the next digit (2) from the dividend to 81 and continue with: 812 / 86

Let's proceed to step 4:
86 goes into 812 9 times with a remainder of 38.
Use 9 as the next digit of our solution. 
Result so far: 29.0
If we subtract 774 from 812, we get 38.
Include the next digit (9) from the dividend after 38, then repeat: 389 / 86

Going ahead to step 5:
The number 86 fits into 389 4 times, leaving a remainder of 45.
The number 4 becomes the next digit in our result. 
Result so far: 294.0
Deduct 344 from 389 and we're left with 45.
Grab the next digit (1) from the dividend, add it to 45, then carry on: 451 / 86

Let's proceed to step 6:
86 can be fit into 451 5 times, resulting in a remainder of 21.
The next digit of our result is 5. 
Result so far: 2945.0
Subtract 430 from 451 to get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Step 7:
When dividing 210 by 86, we get 2 with a remainder of 38.
Record the quotient 2 as the next digit in the result. 
Result so far: 2945.2
If we subtract 172 from 210, we get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Moving on to step 8:
380 divided by 86 is 4 with a remainder of 36.
Write down 4 as next digit of the result. 
Result so far: 2945.24
If we take 344 away from 380, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Advancing to step 9:
The number 86 fits into 360 4 times, leaving a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 2945.244
Subtracting 344 from 360 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

The quotient of the division is 2945.244, and the remainder is 0.0016.