We look at the division of 719628 by 15 
The aim is to understand the frequency of 15 in 719628.

Step 1:
7 divided by 15 is 0 with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Fetch the next digit (1) from the dividend, attach it to 7 and continue: 71 / 15

Step 2:
The number 15 fits into 71 4 times, leaving a remainder of 11.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
Deduct 60 from 71 and we're left with 11.
Fetch the next digit (9) from the dividend, attach it to 11 and continue: 119 / 15

Moving on to step 3:
15 can be fit into 119 7 times, resulting in a remainder of 14.
Use 7 as the next digit of our solution. 
Result so far: 47.0
Subtract 105 from 119 to get 14.
Grab the next digit (6) from the dividend, add it to 14, then carry on: 146 / 15

On to step 4:
If we divide 146 by 15, we get 9 and a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 479.0
If we subtract 135 from 146, we get 11.
Include the next digit (2) from the dividend after 11, then repeat: 112 / 15

Step 5:
15 goes into 112 7 times with a remainder of 7.
The next digit of our result is 7. 
Result so far: 4797.0
Subtracting 105 from 112 leaves us with 7.
Grab the next digit (8) from the dividend, add it to 7, then carry on: 78 / 15

Going ahead to step 6:
When dividing 78 by 15, we get 5 with a remainder of 3.
The next digit of our result is 5. 
Result so far: 47975.0
If we subtract 75 from 78, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 7:
If we divide 30 by 15, we get 2 and a remainder of 0.
Record the quotient 2 as the next digit in the result. 
Result so far: 47975.2
Deduct 30 from 30 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
The number 15 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 47975.2
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 9:
The number 15 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 47975.2
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 47975.2 and a remainder of 0.0.