We're dividing 356709 by 86 
The aim is to understand the frequency of 86 in 356709.

Advancing to step 1:
3 divided by 86 is 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Append the next digit (5) from the dividend to 3 and continue with: 35 / 86

Let's proceed to step 2:
86 goes into 35 0 times with a remainder of 35.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 35, we end up with 35.
Fetch the next digit (6) from the dividend, attach it to 35 and continue: 356 / 86

Advancing to step 3:
When dividing 356 by 86, we get 4 with a remainder of 12.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
Deduct 344 from 356 and we're left with 12.
Append the next digit (7) from the dividend to 12 and continue with: 127 / 86

Advancing to step 4:
If we divide 127 by 86, we get 1 and a remainder of 41.
Write down 1 as next digit of the result. 
Result so far: 41.0
The remainder is 41 after subtracting 86 from 127.
Bring next digit (0) of the dividend behind the 41 and repeat the process: 410 / 86

Advancing to step 5:
86 can be fit into 410 4 times, resulting in a remainder of 66.
The next digit of our result is 4. 
Result so far: 414.0
If we subtract 344 from 410, we get 66.
Append the next digit (9) from the dividend to 66 and continue with: 669 / 86

Let's proceed to step 6:
If we divide 669 by 86, we get 7 and a remainder of 67.
The next digit of our result is 7. 
Result so far: 4147.0
Subtracting 602 from 669 leaves us 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.

Moving on to step 7:
670 divided by 86 is 7 with a remainder of 68.
The next digit of our result is 7. 
Result so far: 4147.7
Subtracting 602 from 670 leaves us 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.

On to step 8:
When dividing 680 by 86, we get 7 with a remainder of 78.
Record the quotient 7 as the next digit in the result. 
Result so far: 4147.77
The remainder is 78 after subtracting 602 from 680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

The quotient of the division is 4147.77, and the remainder is 0.078.