We look at the division of 871305 by 72 
The aim is to understand the frequency of 72 in 871305.

Advancing to step 1:
8 divided by 72 is 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Bring next digit (7) of the dividend behind the 8 and repeat the process: 87 / 72

Let's proceed to step 2:
87 divided by 72 is 1 with a remainder of 15.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 72 from 87 and we're left with 15.
Fetch the next digit (1) from the dividend, attach it to 15 and continue: 151 / 72

Let's proceed to step 3:
151 divided by 72 is 2 with a remainder of 7.
The next digit of our result is 2. 
Result so far: 12.0
If we subtract 144 from 151, we get 7.
Fetch the next digit (3) from the dividend, attach it to 7 and continue: 73 / 72

Moving on to step 4:
If we divide 73 by 72, we get 1 and a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 121.0
Deduct 72 from 73 and we're left with 1.
Include the next digit (0) from the dividend after 1, then repeat: 10 / 72

Moving on to step 5:
10 divided by 72 is 0 with a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 1210.0
If we subtract 0 from 10, we get 10.
Take the next digit (5) from the dividend and append it to 10, then repeat: 105 / 72

Advancing to step 6:
72 goes into 105 1 times with a remainder of 33.
The next digit of our result is 1. 
Result so far: 12101.0
If we subtract 72 from 105, we get 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Going ahead to step 7:
72 can be fit into 330 4 times, resulting in a remainder of 42.
Record the quotient 4 as the next digit in the result. 
Result so far: 12101.4
The remainder is 42 after subtracting 288 from 330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Step 8:
72 can be fit into 420 5 times, resulting in a remainder of 60.
Put 5 as the next digit of the answer. 
Result so far: 12101.45
Deduct 360 from 420 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 9:
The number 72 fits into 600 8 times, leaving a remainder of 24.
Put 8 as the next digit of the answer. 
Result so far: 12101.458
Subtract 576 from 600 to get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 10:
72 can be fit into 240 3 times, resulting in a remainder of 24.
The next digit of our result is 3. 
Result so far: 12101.4583
Subtracting 216 from 240 leaves us with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 11:
When dividing 240 by 72, we get 3 with a remainder of 24.
The next digit of our result is 3. 
Result so far: 12101.45833
The remainder is 24 after subtracting 216 from 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

The final result is 12101.45833 with a remainder of 2.4e-05.