We look at the division of 621286 by 86 
The aim is to understand the frequency of 86 in 621286.

Step 1:
86 can be fit into 6 0 times, resulting in a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Grab the next digit (2) from the dividend, add it to 6, then carry on: 62 / 86

Advancing to step 2:
86 goes into 62 0 times with a remainder of 62.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 62 and we're left with 62.
Take the next digit (1) from the dividend and append it to 62, then repeat: 621 / 86

Let's proceed to step 3:
When dividing 621 by 86, we get 7 with a remainder of 19.
Write down 7 as next digit of the result. 
Result so far: 7.0
Deduct 602 from 621 and we're left with 19.
Grab the next digit (2) from the dividend, add it to 19, then carry on: 192 / 86

Moving on to step 4:
192 divided by 86 is 2 with a remainder of 20.
The number 2 becomes the next digit in our result. 
Result so far: 72.0
If we take 172 away from 192, we end up with 20.
Bring next digit (8) of the dividend behind the 20 and repeat the process: 208 / 86

On to step 5:
86 goes into 208 2 times with a remainder of 36.
Put 2 as the next digit of the answer. 
Result so far: 722.0
Subtracting 172 from 208 leaves us with 36.
Fetch the next digit (6) from the dividend, attach it to 36 and continue: 366 / 86

Let's proceed to step 6:
If we divide 366 by 86, we get 4 and a remainder of 22.
Put 4 as the next digit of the answer. 
Result so far: 7224.0
If we subtract 344 from 366, we get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

On to step 7:
If we divide 220 by 86, we get 2 and a remainder of 48.
Record the quotient 2 as the next digit in the result. 
Result so far: 7224.2
Subtract 172 from 220 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Moving on to step 8:
If we divide 480 by 86, we get 5 and a remainder of 50.
The next digit of our result is 5. 
Result so far: 7224.25
Subtracting 430 from 480 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 9:
86 can be fit into 500 5 times, resulting in a remainder of 70.
Use 5 as the next digit of our solution. 
Result so far: 7224.255
Subtract 430 from 500 to get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

The quotient of the division is 7224.255, and the remainder is 0.007.