Let's divide 510893 by 15
The aim is to understand the frequency of 15 in 510893.

On to step 1:
15 can be fit into 5 0 times, resulting in a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Append the next digit (1) from the dividend to 5 and continue with: 51 / 15

Moving on to step 2:
15 goes into 51 3 times with a remainder of 6.
The next digit of our result is 3. 
Result so far: 3.0
If we subtract 45 from 51, we get 6.
Take the next digit (0) from the dividend and append it to 6, then repeat: 60 / 15

Let's proceed to step 3:
15 can be fit into 60 4 times, resulting in a remainder of 0.
The number 4 becomes the next digit in our result. 
Result so far: 34.0
Subtracting 60 from 60 leaves us with 0.
Bring next digit (8) of the dividend behind the 0 and repeat the process: 8 / 15

Let's proceed to step 4:
8 divided by 15 is 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 340.0
Subtract 0 from 8 to get 8.
Bring next digit (9) of the dividend behind the 8 and repeat the process: 89 / 15

Let's proceed to step 5:
If we divide 89 by 15, we get 5 and a remainder of 14.
Write down 5 as next digit of the result. 
Result so far: 3405.0
Subtract 75 from 89 to get 14.
Grab the next digit (3) from the dividend, add it to 14, then carry on: 143 / 15

Let's proceed to step 6:
The number 15 fits into 143 9 times, leaving a remainder of 8.
Record the quotient 9 as the next digit in the result. 
Result so far: 34059.0
Deduct 135 from 143 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 7:
When dividing 80 by 15, we get 5 with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 34059.5
If we take 75 away from 80, 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.

Step 8:
15 can be fit into 50 3 times, resulting in a remainder of 5.
Record the quotient 3 as the next digit in the result. 
Result so far: 34059.53
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.

Step 9:
The number 15 fits into 50 3 times, leaving a remainder of 5.
Put 3 as the next digit of the answer. 
Result so far: 34059.533
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.

After the division, we end up with 34059.533 and a remainder of 0.0005.