790721 ÷ 51 
The aim is to understand the frequency of 51 in 790721.

Step 1:
51 can be fit into 7 0 times, resulting in a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Bring next digit (9) of the dividend behind the 7 and repeat the process: 79 / 51

Advancing to step 2:
If we divide 79 by 51, we get 1 and a remainder of 28.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 51 away from 79, we end up with 28.
Fetch the next digit (0) from the dividend, attach it to 28 and continue: 280 / 51

Step 3:
51 can be fit into 280 5 times, resulting in a remainder of 25.
Use 5 as the next digit of our solution. 
Result so far: 15.0
The remainder is 25 after subtracting 255 from 280.
Fetch the next digit (7) from the dividend, attach it to 25 and continue: 257 / 51

Step 4:
257 divided by 51 is 5 with a remainder of 2.
The next digit of our result is 5. 
Result so far: 155.0
The remainder is 2 after subtracting 255 from 257.
Bring next digit (2) of the dividend behind the 2 and repeat the process: 22 / 51

Moving on to step 5:
The number 51 fits into 22 0 times, leaving a remainder of 22.
The next digit of our result is 0. 
Result so far: 1550.0
Deduct 0 from 22 and we're left with 22.
Include the next digit (1) from the dividend after 22, then repeat: 221 / 51

Moving on to step 6:
51 can be fit into 221 4 times, resulting in a remainder of 17.
The next digit of our result is 4. 
Result so far: 15504.0
If we take 204 away from 221, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Advancing to step 7:
170 divided by 51 is 3 with a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 15504.3
Deduct 153 from 170 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 8:
The number 51 fits into 170 3 times, leaving a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 15504.33
Subtracting 153 from 170 leaves us with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

The quotient of the division is 15504.33, and the remainder is 0.017.