405470 divided by 86 
The aim is to understand the frequency of 86 in 405470.

On to step 1:
86 goes into 4 0 times with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Bring next digit (0) of the dividend behind the 4 and repeat the process: 40 / 86

On to step 2:
The number 86 fits into 40 0 times, leaving a remainder of 40.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 40 after subtracting 0 from 40.
Include the next digit (5) from the dividend after 40, then repeat: 405 / 86

Going ahead to step 3:
405 divided by 86 is 4 with a remainder of 61.
The next digit of our result is 4. 
Result so far: 4.0
The remainder is 61 after subtracting 344 from 405.
Append the next digit (4) from the dividend to 61 and continue with: 614 / 86

Moving on to step 4:
The number 86 fits into 614 7 times, leaving a remainder of 12.
Put 7 as the next digit of the answer. 
Result so far: 47.0
Subtract 602 from 614 to get 12.
Bring next digit (7) of the dividend behind the 12 and repeat the process: 127 / 86

On to step 5:
The number 86 fits into 127 1 times, leaving a remainder of 41.
The number 1 becomes the next digit in our result. 
Result so far: 471.0
Subtracting 86 from 127 leaves us with 41.
Include the next digit (0) from the dividend after 41, then repeat: 410 / 86

Let's proceed to step 6:
If we divide 410 by 86, we get 4 and a remainder of 66.
Put 4 as the next digit of the answer. 
Result so far: 4714.0
Subtract 344 from 410 to get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

On to step 7:
The number 86 fits into 660 7 times, leaving a remainder of 58.
Put 7 as the next digit of the answer. 
Result so far: 4714.7
If we subtract 602 from 660, we get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Going ahead to step 8:
When dividing 580 by 86, we get 6 with a remainder of 64.
The next digit of our result is 6. 
Result so far: 4714.76
If we take 516 away from 580, we end up 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.

Going ahead to step 9:
The number 86 fits into 640 7 times, leaving a remainder of 38.
The number 7 becomes the next digit in our result. 
Result so far: 4714.767
Subtracting 602 from 640 leaves us 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.

Let's proceed to step 10:
The number 86 fits into 380 4 times, leaving a remainder of 36.
Record the quotient 4 as the next digit in the result. 
Result so far: 4714.7674
If we subtract 344 from 380, we get 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 11:
86 goes into 360 4 times with a remainder of 16.
The next digit of our result is 4. 
Result so far: 4714.76744
If we subtract 344 from 360, we get 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 final result is 4714.76744 with a remainder of 1.6e-05.