Let's divide 519838 by 15
The aim is to understand the frequency of 15 in 519838.

Going ahead to step 1:
When dividing 5 by 15, we get 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Grab the next digit (1) from the dividend, add it to 5, then carry on: 51 / 15

Advancing to step 2:
The number 15 fits into 51 3 times, leaving a remainder of 6.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we take 45 away from 51, we end up with 6.
Append the next digit (9) from the dividend to 6 and continue with: 69 / 15

Moving on to step 3:
If we divide 69 by 15, we get 4 and a remainder of 9.
The number 4 becomes the next digit in our result. 
Result so far: 34.0
Deduct 60 from 69 and we're left with 9.
Grab the next digit (8) from the dividend, add it to 9, then carry on: 98 / 15

Moving on to step 4:
The number 15 fits into 98 6 times, leaving a remainder of 8.
The next digit of our result is 6. 
Result so far: 346.0
Subtract 90 from 98 to get 8.
Append the next digit (3) from the dividend to 8 and continue with: 83 / 15

Let's proceed to step 5:
15 goes into 83 5 times with a remainder of 8.
Write down 5 as next digit of the result. 
Result so far: 3465.0
Subtract 75 from 83 to get 8.
Bring next digit (8) of the dividend behind the 8 and repeat the process: 88 / 15

Let's proceed to step 6:
15 can be fit into 88 5 times, resulting in a remainder of 13.
The number 5 becomes the next digit in our result. 
Result so far: 34655.0
Subtract 75 from 88 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

On to step 7:
When dividing 130 by 15, we get 8 with a remainder of 10.
The number 8 becomes the next digit in our result. 
Result so far: 34655.8
If we take 120 away from 130, we end up 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.

Going ahead to step 8:
15 can be fit into 100 6 times, resulting in a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 34655.86
Subtract 90 from 100 to 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:
100 divided by 15 is 6 with a remainder of 10.
Record the quotient 6 as the next digit in the result. 
Result so far: 34655.866
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.

The quotient of the division is 34655.866, and the remainder is 0.001.