We're dividing 721001 by 86 
The aim is to understand the frequency of 86 in 721001.

Let's proceed to step 1:
The number 86 fits into 7 0 times, leaving a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Append the next digit (2) from the dividend to 7 and continue with: 72 / 86

Going ahead to step 2:
When dividing 72 by 86, we get 0 with a remainder of 72.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 72 after subtracting 0 from 72.
Include the next digit (1) from the dividend after 72, then repeat: 721 / 86

Going ahead to step 3:
86 goes into 721 8 times with a remainder of 33.
Put 8 as the next digit of the answer. 
Result so far: 8.0
If we take 688 away from 721, we end up with 33.
Append the next digit (0) from the dividend to 33 and continue with: 330 / 86

Going ahead to step 4:
If we divide 330 by 86, we get 3 and a remainder of 72.
Put 3 as the next digit of the answer. 
Result so far: 83.0
Subtract 258 from 330 to get 72.
Fetch the next digit (0) from the dividend, attach it to 72 and continue: 720 / 86

Step 5:
86 goes into 720 8 times with a remainder of 32.
Use 8 as the next digit of our solution. 
Result so far: 838.0
Deduct 688 from 720 and we're left with 32.
Bring next digit (1) of the dividend behind the 32 and repeat the process: 321 / 86

On to step 6:
86 goes into 321 3 times with a remainder of 63.
Record the quotient 3 as the next digit in the result. 
Result so far: 8383.0
Deduct 258 from 321 and we're left with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

On to step 7:
The number 86 fits into 630 7 times, leaving a remainder of 28.
The number 7 becomes the next digit in our result. 
Result so far: 8383.7
The remainder is 28 after subtracting 602 from 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Let's proceed to step 8:
If we divide 280 by 86, we get 3 and a remainder of 22.
Write down 3 as next digit of the result. 
Result so far: 8383.73
Subtracting 258 from 280 leaves us with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Going ahead to step 9:
The number 86 fits into 220 2 times, leaving a remainder of 48.
Write down 2 as next digit of the result. 
Result so far: 8383.732
Subtracting 172 from 220 leaves us with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Going ahead to step 10:
480 divided by 86 is 5 with a remainder of 50.
Record the quotient 5 as the next digit in the result. 
Result so far: 8383.7325
Deduct 430 from 480 and we're left 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 11:
86 can be fit into 500 5 times, resulting in a remainder of 70.
Write down 5 as next digit of the result. 
Result so far: 8383.73255
The remainder is 70 after subtracting 430 from 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

The final result is 8383.73255 with a remainder of 7e-05.