39799 ÷ 72 
The aim is to understand the frequency of 72 in 39799.

Step 1:
When dividing 3 by 72, we get 0 with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Take the next digit (9) from the dividend and append it to 3, then repeat: 39 / 72

Step 2:
39 divided by 72 is 0 with a remainder of 39.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 39 to get 39.
Grab the next digit (7) from the dividend, add it to 39, then carry on: 397 / 72

Advancing to step 3:
When dividing 397 by 72, we get 5 with a remainder of 37.
Put 5 as the next digit of the answer. 
Result so far: 5.0
Deduct 360 from 397 and we're left with 37.
Take the next digit (9) from the dividend and append it to 37, then repeat: 379 / 72

On to step 4:
If we divide 379 by 72, we get 5 and a remainder of 19.
Put 5 as the next digit of the answer. 
Result so far: 55.0
If we take 360 away from 379, we end up with 19.
Append the next digit (9) from the dividend to 19 and continue with: 199 / 72

Going ahead to step 5:
The number 72 fits into 199 2 times, leaving a remainder of 55.
Write down 2 as next digit of the result. 
Result so far: 552.0
The remainder is 55 after subtracting 144 from 199.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

On to step 6:
If we divide 550 by 72, we get 7 and a remainder of 46.
Write down 7 as next digit of the result. 
Result so far: 552.7
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.

On to step 7:
When dividing 460 by 72, we get 6 with a remainder of 28.
The number 6 becomes the next digit in our result. 
Result so far: 552.76
Subtracting 432 from 460 leaves us 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.

Step 8:
72 goes into 280 3 times with a remainder of 64.
The next digit of our result is 3. 
Result so far: 552.763
Subtract 216 from 280 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.

Moving on to step 9:
If we divide 640 by 72, we get 8 and a remainder of 64.
The number 8 becomes the next digit in our result. 
Result so far: 552.7638
Deduct 576 from 640 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.

Advancing to step 10:
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: 552.76388
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 552.76388 and a remainder of 6.4e-05.