We look at the division of 150285 by 15 
The aim is to understand the frequency of 15 in 150285.

On to step 1:
15 can be fit into 1 0 times, resulting in a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 15

Advancing to step 2:
If we divide 15 by 15, we get 1 and a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtracting 15 from 15 leaves us with 0.
Bring next digit (0) of the dividend behind the 0 and repeat the process: 0 / 15

Moving on to step 3:
The number 15 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 10.0
Subtract 0 from 0 to get 0.
Append the next digit (2) from the dividend to 0 and continue with: 2 / 15

Step 4:
The number 15 fits into 2 0 times, leaving a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 100.0
If we take 0 away from 2, we end up with 2.
Grab the next digit (8) from the dividend, add it to 2, then carry on: 28 / 15

Moving on to step 5:
The number 15 fits into 28 1 times, leaving a remainder of 13.
Write down 1 as next digit of the result. 
Result so far: 1001.0
If we take 15 away from 28, we end up with 13.
Take the next digit (5) from the dividend and append it to 13, then repeat: 135 / 15

Step 6:
135 divided by 15 is 9 with a remainder of 0.
The number 9 becomes the next digit in our result. 
Result so far: 10019.0
Subtract 135 from 135 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 7:
0 divided by 15 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 10019.0
Subtracting 0 from 0 leaves us 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.

Advancing to step 8:
0 divided by 15 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 10019.0
Subtracting 0 from 0 leaves us 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 10019.0 and a remainder of 0.0.