Let's divide 403121 by 72
The aim is to understand the frequency of 72 in 403121.

Step 1:
72 goes into 4 0 times with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Fetch the next digit (0) from the dividend, attach it to 4 and continue: 40 / 72

Advancing to step 2:
40 divided by 72 is 0 with a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 40 and we're left with 40.
Include the next digit (3) from the dividend after 40, then repeat: 403 / 72

Moving on to step 3:
72 can be fit into 403 5 times, resulting in a remainder of 43.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
Subtracting 360 from 403 leaves us with 43.
Append the next digit (1) from the dividend to 43 and continue with: 431 / 72

On to step 4:
When dividing 431 by 72, we get 5 with a remainder of 71.
The next digit of our result is 5. 
Result so far: 55.0
Subtract 360 from 431 to get 71.
Include the next digit (2) from the dividend after 71, then repeat: 712 / 72

On to step 5:
The number 72 fits into 712 9 times, leaving a remainder of 64.
Write down 9 as next digit of the result. 
Result so far: 559.0
If we take 648 away from 712, we end up with 64.
Append the next digit (1) from the dividend to 64 and continue with: 641 / 72

Step 6:
641 divided by 72 is 8 with a remainder of 65.
The next digit of our result is 8. 
Result so far: 5598.0
Subtracting 576 from 641 leaves us with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Advancing to step 7:
72 goes into 650 9 times with a remainder of 2.
Record the quotient 9 as the next digit in the result. 
Result so far: 5598.9
Subtracting 648 from 650 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 8:
The number 72 fits into 20 0 times, leaving a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 5598.9
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 9:
When dividing 200 by 72, we get 2 with a remainder of 56.
Put 2 as the next digit of the answer. 
Result so far: 5598.902
The remainder is 56 after subtracting 144 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Let's proceed to step 10:
When dividing 560 by 72, we get 7 with a remainder of 56.
The next digit of our result is 7. 
Result so far: 5598.9027
Subtracting 504 from 560 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Going ahead to step 11:
72 goes into 560 7 times with a remainder of 56.
Write down 7 as next digit of the result. 
Result so far: 5598.90277
If we take 504 away from 560, we end up with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

The final result is 5598.90277 with a remainder of 5.6e-05.