578415 ÷ 79 
The aim is to understand the frequency of 79 in 578415.

Step 1:
79 goes into 5 0 times with a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Include the next digit (7) from the dividend after 5, then repeat: 57 / 79

On to step 2:
When dividing 57 by 79, we get 0 with a remainder of 57.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 57 after subtracting 0 from 57.
Take the next digit (8) from the dividend and append it to 57, then repeat: 578 / 79

On to step 3:
If we divide 578 by 79, we get 7 and a remainder of 25.
The next digit of our result is 7. 
Result so far: 7.0
Subtract 553 from 578 to get 25.
Append the next digit (4) from the dividend to 25 and continue with: 254 / 79

Advancing to step 4:
The number 79 fits into 254 3 times, leaving a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 73.0
Subtract 237 from 254 to get 17.
Include the next digit (1) from the dividend after 17, then repeat: 171 / 79

Moving on to step 5:
The number 79 fits into 171 2 times, leaving a remainder of 13.
The next digit of our result is 2. 
Result so far: 732.0
Subtracting 158 from 171 leaves us with 13.
Take the next digit (5) from the dividend and append it to 13, then repeat: 135 / 79

Step 6:
135 divided by 79 is 1 with a remainder of 56.
Use 1 as the next digit of our solution. 
Result so far: 7321.0
Subtracting 79 from 135 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.

Let's proceed to step 7:
The number 79 fits into 560 7 times, leaving a remainder of 7.
The number 7 becomes the next digit in our result. 
Result so far: 7321.7
Deduct 553 from 560 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Advancing to step 8:
When dividing 70 by 79, we get 0 with a remainder of 70.
The next digit of our result is 0. 
Result so far: 7321.7
The remainder is 70 after subtracting 0 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Let's proceed to step 9:
The number 79 fits into 700 8 times, leaving a remainder of 68.
Record the quotient 8 as the next digit in the result. 
Result so far: 7321.708
If we subtract 632 from 700, we get 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Let's proceed to step 10:
The number 79 fits into 680 8 times, leaving a remainder of 48.
Record the quotient 8 as the next digit in the result. 
Result so far: 7321.7088
The remainder is 48 after subtracting 632 from 680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

After the division, we end up with 7321.7088 and a remainder of 0.00048.