We divide 86380390 by 72
The aim is to understand the frequency of 72 in 86380390.

Advancing to step 1:
When dividing 8 by 72, we get 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 72

Going ahead to step 2:
When dividing 86 by 72, we get 1 with a remainder of 14.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 72 from 86 leaves us with 14.
Include the next digit (3) from the dividend after 14, then repeat: 143 / 72

On to step 3:
When dividing 143 by 72, we get 1 with a remainder of 71.
Record the quotient 1 as the next digit in the result. 
Result so far: 11.0
Subtract 72 from 143 to get 71.
Bring next digit (8) of the dividend behind the 71 and repeat the process: 718 / 72

On to step 4:
If we divide 718 by 72, we get 9 and a remainder of 70.
Write down 9 as next digit of the result. 
Result so far: 119.0
If we take 648 away from 718, we end up with 70.
Include the next digit (0) from the dividend after 70, then repeat: 700 / 72

Advancing to step 5:
If we divide 700 by 72, we get 9 and a remainder of 52.
Put 9 as the next digit of the answer. 
Result so far: 1199.0
Subtracting 648 from 700 leaves us with 52.
Include the next digit (3) from the dividend after 52, then repeat: 523 / 72

Advancing to step 6:
72 can be fit into 523 7 times, resulting in a remainder of 19.
The number 7 becomes the next digit in our result. 
Result so far: 11997.0
The remainder is 19 after subtracting 504 from 523.
Append the next digit (9) from the dividend to 19 and continue with: 199 / 72

Step 7:
72 can be fit into 199 2 times, resulting in a remainder of 55.
Record the quotient 2 as the next digit in the result. 
Result so far: 119972.0
If we subtract 144 from 199, we get 55.
Include the next digit (0) from the dividend after 55, then repeat: 550 / 72

Let's proceed to step 8:
When dividing 550 by 72, we get 7 with a remainder of 46.
Put 7 as the next digit of the answer. 
Result so far: 1199727.0
The remainder is 46 after subtracting 504 from 550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Let's proceed to step 9:
72 goes into 460 6 times with a remainder of 28.
Put 6 as the next digit of the answer. 
Result so far: 1199727.6
The remainder is 28 after subtracting 432 from 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Advancing to step 10:
The number 72 fits into 280 3 times, leaving a remainder of 64.
The next digit of our result is 3. 
Result so far: 1199727.63
The remainder is 64 after subtracting 216 from 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Step 11:
The number 72 fits into 640 8 times, leaving a remainder of 64.
Put 8 as the next digit of the answer. 
Result so far: 1199727.638
Subtracting 576 from 640 leaves us 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.

Let's proceed to step 12:
When dividing 640 by 72, we get 8 with a remainder of 64.
Write down 8 as next digit of the result. 
Result so far: 1199727.6388
If we take 576 away from 640, 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.

After the division, we end up with 1199727.6388 and a remainder of 0.00064.