548243 divided by 15 
The aim is to understand the frequency of 15 in 548243.

Going ahead to step 1:
When dividing 5 by 15, we get 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Take the next digit (4) from the dividend and append it to 5, then repeat: 54 / 15

Moving on to step 2:
When dividing 54 by 15, we get 3 with a remainder of 9.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Subtract 45 from 54 to get 9.
Take the next digit (8) from the dividend and append it to 9, then repeat: 98 / 15

Moving on to step 3:
15 goes into 98 6 times with a remainder of 8.
The next digit of our result is 6. 
Result so far: 36.0
If we subtract 90 from 98, we get 8.
Bring next digit (2) of the dividend behind the 8 and repeat the process: 82 / 15

Step 4:
The number 15 fits into 82 5 times, leaving a remainder of 7.
Put 5 as the next digit of the answer. 
Result so far: 365.0
Deduct 75 from 82 and we're left with 7.
Append the next digit (4) from the dividend to 7 and continue with: 74 / 15

Advancing to step 5:
15 can be fit into 74 4 times, resulting in a remainder of 14.
Record the quotient 4 as the next digit in the result. 
Result so far: 3654.0
The remainder is 14 after subtracting 60 from 74.
Include the next digit (3) from the dividend after 14, then repeat: 143 / 15

On to step 6:
15 goes into 143 9 times with a remainder of 8.
Write down 9 as next digit of the result. 
Result so far: 36549.0
If we subtract 135 from 143, we 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.

Advancing to step 7:
If we divide 80 by 15, we get 5 and a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 36549.5
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.

Going ahead to step 8:
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: 36549.53
If we subtract 45 from 50, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 9:
15 goes into 50 3 times with a remainder of 5.
Use 3 as the next digit of our solution. 
Result so far: 36549.533
The remainder is 5 after subtracting 45 from 50.
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 36549.533 and a remainder of 0.0005.