We look at the division of 439298 by 15 
The aim is to understand the frequency of 15 in 439298.

Going ahead to step 1:
4 divided by 15 is 0 with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Take the next digit (3) from the dividend and append it to 4, then repeat: 43 / 15

Let's proceed to step 2:
43 divided by 15 is 2 with a remainder of 13.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtracting 30 from 43 leaves us with 13.
Bring next digit (9) of the dividend behind the 13 and repeat the process: 139 / 15

On to step 3:
15 can be fit into 139 9 times, resulting in a remainder of 4.
Record the quotient 9 as the next digit in the result. 
Result so far: 29.0
Deduct 135 from 139 and we're left with 4.
Grab the next digit (2) from the dividend, add it to 4, then carry on: 42 / 15

Let's proceed to step 4:
The number 15 fits into 42 2 times, leaving a remainder of 12.
Record the quotient 2 as the next digit in the result. 
Result so far: 292.0
Deduct 30 from 42 and we're left with 12.
Fetch the next digit (9) from the dividend, attach it to 12 and continue: 129 / 15

Let's proceed to step 5:
The number 15 fits into 129 8 times, leaving a remainder of 9.
Record the quotient 8 as the next digit in the result. 
Result so far: 2928.0
Deduct 120 from 129 and we're left with 9.
Bring next digit (8) of the dividend behind the 9 and repeat the process: 98 / 15

Going ahead to step 6:
98 divided by 15 is 6 with a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 29286.0
Subtract 90 from 98 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 7:
80 divided by 15 is 5 with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 29286.5
The remainder is 5 after subtracting 75 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 8:
The number 15 fits into 50 3 times, leaving a remainder of 5.
The next digit of our result is 3. 
Result so far: 29286.53
If we take 45 away from 50, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 9:
The number 15 fits into 50 3 times, leaving a remainder of 5.
Write down 3 as next digit of the result. 
Result so far: 29286.533
Deduct 45 from 50 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

After the division, we end up with 29286.533 and a remainder of 0.0005.