We look at the division of 24378 by 15 
The aim is to understand the frequency of 15 in 24378.

Let's proceed to step 1:
If we divide 2 by 15, we get 0 and a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Fetch the next digit (4) from the dividend, attach it to 2 and continue: 24 / 15

On to step 2:
24 divided by 15 is 1 with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 9 after subtracting 15 from 24.
Include the next digit (3) from the dividend after 9, then repeat: 93 / 15

Moving on to step 3:
15 can be fit into 93 6 times, resulting in a remainder of 3.
Write down 6 as next digit of the result. 
Result so far: 16.0
The remainder is 3 after subtracting 90 from 93.
Fetch the next digit (7) from the dividend, attach it to 3 and continue: 37 / 15

Step 4:
15 can be fit into 37 2 times, resulting in a remainder of 7.
Put 2 as the next digit of the answer. 
Result so far: 162.0
Deduct 30 from 37 and we're left with 7.
Take the next digit (8) from the dividend and append it to 7, then repeat: 78 / 15

On to step 5:
When dividing 78 by 15, we get 5 with a remainder of 3.
The number 5 becomes the next digit in our result. 
Result so far: 1625.0
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 6:
15 goes into 30 2 times with a remainder of 0.
The number 2 becomes the next digit in our result. 
Result so far: 1625.2
If we take 30 away from 30, we end up 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.

Let's proceed to step 7:
15 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 1625.2
If we take 0 away from 0, we end up 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.

Going ahead to step 8:
15 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 1625.2
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.

The quotient of the division is 1625.2, and the remainder is 0.0.