We look at the division of 777439 by 72 
The aim is to understand the frequency of 72 in 777439.

On to step 1:
The number 72 fits into 7 0 times, leaving a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Grab the next digit (7) from the dividend, add it to 7, then carry on: 77 / 72

Moving on to step 2:
72 goes into 77 1 times with a remainder of 5.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 72 away from 77, we end up with 5.
Append the next digit (7) from the dividend to 5 and continue with: 57 / 72

Let's proceed to step 3:
72 goes into 57 0 times with a remainder of 57.
Write down 0 as next digit of the result. 
Result so far: 10.0
Subtract 0 from 57 to get 57.
Grab the next digit (4) from the dividend, add it to 57, then carry on: 574 / 72

Moving on to step 4:
When dividing 574 by 72, we get 7 with a remainder of 70.
The next digit of our result is 7. 
Result so far: 107.0
Subtract 504 from 574 to get 70.
Include the next digit (3) from the dividend after 70, then repeat: 703 / 72

Going ahead to step 5:
The number 72 fits into 703 9 times, leaving a remainder of 55.
Put 9 as the next digit of the answer. 
Result so far: 1079.0
The remainder is 55 after subtracting 648 from 703.
Append the next digit (9) from the dividend to 55 and continue with: 559 / 72

On to step 6:
When dividing 559 by 72, we get 7 with a remainder of 55.
Record the quotient 7 as the next digit in the result. 
Result so far: 10797.0
Deduct 504 from 559 and we're left with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Let's proceed to step 7:
72 goes into 550 7 times with a remainder of 46.
Put 7 as the next digit of the answer. 
Result so far: 10797.7
Deduct 504 from 550 and we're left with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Advancing to step 8:
When dividing 460 by 72, we get 6 with a remainder of 28.
Put 6 as the next digit of the answer. 
Result so far: 10797.76
Deduct 432 from 460 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Going ahead to step 9:
72 goes into 280 3 times with a remainder of 64.
Write down 3 as next digit of the result. 
Result so far: 10797.763
Deduct 216 from 280 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.

Moving on to step 10:
640 divided by 72 is 8 with a remainder of 64.
Put 8 as the next digit of the answer. 
Result so far: 10797.7638
If we subtract 576 from 640, we get 64.
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.
Write down 8 as next digit of the result. 
Result so far: 10797.76388
Subtract 576 from 640 to get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

The final outcome is 10797.76388, with a leftover of 6.4e-05.