Let's divide 393651 by 15
The aim is to understand the frequency of 15 in 393651.

Moving on to step 1:
3 divided by 15 is 0 with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 15

Moving on to step 2:
15 goes into 39 2 times with a remainder of 9.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtract 30 from 39 to get 9.
Grab the next digit (3) from the dividend, add it to 9, then carry on: 93 / 15

Advancing to step 3:
When dividing 93 by 15, we get 6 with a remainder of 3.
Record the quotient 6 as the next digit in the result. 
Result so far: 26.0
If we take 90 away from 93, we end up with 3.
Include the next digit (6) from the dividend after 3, then repeat: 36 / 15

Moving on to step 4:
15 goes into 36 2 times with a remainder of 6.
The next digit of our result is 2. 
Result so far: 262.0
Subtract 30 from 36 to get 6.
Append the next digit (5) from the dividend to 6 and continue with: 65 / 15

Moving on to step 5:
15 goes into 65 4 times with a remainder of 5.
The next digit of our result is 4. 
Result so far: 2624.0
Subtracting 60 from 65 leaves us with 5.
Fetch the next digit (1) from the dividend, attach it to 5 and continue: 51 / 15

Advancing to step 6:
When dividing 51 by 15, we get 3 with a remainder of 6.
Record the quotient 3 as the next digit in the result. 
Result so far: 26243.0
If we take 45 away from 51, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 7:
15 goes into 60 4 times with a remainder of 0.
The next digit of our result is 4. 
Result so far: 26243.4
Subtract 60 from 60 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 8:
When dividing 0 by 15, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 26243.4
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 9:
15 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 26243.4
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.

The final outcome is 26243.4, with a leftover of 0.0.