300421 divided by 86 
The aim is to understand the frequency of 86 in 300421.

Moving on to step 1:
If we divide 3 by 86, we get 0 and a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Take the next digit (0) from the dividend and append it to 3, then repeat: 30 / 86

Step 2:
When dividing 30 by 86, we get 0 with a remainder of 30.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 30, we get 30.
Grab the next digit (0) from the dividend, add it to 30, then carry on: 300 / 86

Going ahead to step 3:
When dividing 300 by 86, we get 3 with a remainder of 42.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we take 258 away from 300, we end up with 42.
Take the next digit (4) from the dividend and append it to 42, then repeat: 424 / 86

Moving on to step 4:
86 can be fit into 424 4 times, resulting in a remainder of 80.
Use 4 as the next digit of our solution. 
Result so far: 34.0
The remainder is 80 after subtracting 344 from 424.
Include the next digit (2) from the dividend after 80, then repeat: 802 / 86

Advancing to step 5:
If we divide 802 by 86, we get 9 and a remainder of 28.
The next digit of our result is 9. 
Result so far: 349.0
Subtract 774 from 802 to get 28.
Bring next digit (1) of the dividend behind the 28 and repeat the process: 281 / 86

Step 6:
The number 86 fits into 281 3 times, leaving a remainder of 23.
Put 3 as the next digit of the answer. 
Result so far: 3493.0
The remainder is 23 after subtracting 258 from 281.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

On to step 7:
The number 86 fits into 230 2 times, leaving a remainder of 58.
Record the quotient 2 as the next digit in the result. 
Result so far: 3493.2
If we subtract 172 from 230, 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.

Step 8:
When dividing 580 by 86, we get 6 with a remainder of 64.
Use 6 as the next digit of our solution. 
Result so far: 3493.26
Deduct 516 from 580 and we're left 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.
Write down 7 as next digit of the result. 
Result so far: 3493.267
The remainder is 38 after subtracting 602 from 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

On to step 10:
86 can be fit into 380 4 times, resulting in a remainder of 36.
The next digit of our result is 4. 
Result so far: 3493.2674
Subtracting 344 from 380 leaves us 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.

Moving on to step 11:
86 goes into 360 4 times with a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 3493.26744
Deduct 344 from 360 and we're left 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.

In conclusion, the division gives 3493.26744 with a balance of 1.6e-05.