We look at the division of 897208 by 15 
The aim is to understand the frequency of 15 in 897208.

Let's proceed to step 1:
If we divide 8 by 15, we get 0 and a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Bring next digit (9) of the dividend behind the 8 and repeat the process: 89 / 15

On to step 2:
89 divided by 15 is 5 with a remainder of 14.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
Subtracting 75 from 89 leaves us with 14.
Grab the next digit (7) from the dividend, add it to 14, then carry on: 147 / 15

Let's proceed to step 3:
If we divide 147 by 15, we get 9 and a remainder of 12.
The next digit of our result is 9. 
Result so far: 59.0
Subtract 135 from 147 to get 12.
Grab the next digit (2) from the dividend, add it to 12, then carry on: 122 / 15

Let's proceed to step 4:
15 can be fit into 122 8 times, resulting in a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 598.0
The remainder is 2 after subtracting 120 from 122.
Grab the next digit (0) from the dividend, add it to 2, then carry on: 20 / 15

Step 5:
20 divided by 15 is 1 with a remainder of 5.
Record the quotient 1 as the next digit in the result. 
Result so far: 5981.0
Deduct 15 from 20 and we're left with 5.
Include the next digit (8) from the dividend after 5, then repeat: 58 / 15

Advancing to step 6:
58 divided by 15 is 3 with a remainder of 13.
The number 3 becomes the next digit in our result. 
Result so far: 59813.0
The remainder is 13 after subtracting 45 from 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Advancing to step 7:
If we divide 130 by 15, we get 8 and a remainder of 10.
Put 8 as the next digit of the answer. 
Result so far: 59813.8
Subtracting 120 from 130 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 8:
15 can be fit into 100 6 times, resulting in a remainder of 10.
Use 6 as the next digit of our solution. 
Result so far: 59813.86
If we subtract 90 from 100, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 9:
15 can be fit into 100 6 times, resulting in a remainder of 10.
The number 6 becomes the next digit in our result. 
Result so far: 59813.866
Deduct 90 from 100 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

After the division, we end up with 59813.866 and a remainder of 0.001.