We divide 413698 by 15
The aim is to understand the frequency of 15 in 413698.

Moving on to step 1:
When dividing 4 by 15, we get 0 with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Grab the next digit (1) from the dividend, add it to 4, then carry on: 41 / 15

Let's proceed to step 2:
If we divide 41 by 15, we get 2 and a remainder of 11.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
The remainder is 11 after subtracting 30 from 41.
Take the next digit (3) from the dividend and append it to 11, then repeat: 113 / 15

Going ahead to step 3:
113 divided by 15 is 7 with a remainder of 8.
The number 7 becomes the next digit in our result. 
Result so far: 27.0
If we take 105 away from 113, we end up with 8.
Include the next digit (6) from the dividend after 8, then repeat: 86 / 15

Advancing to step 4:
If we divide 86 by 15, we get 5 and a remainder of 11.
Write down 5 as next digit of the result. 
Result so far: 275.0
Subtracting 75 from 86 leaves us with 11.
Fetch the next digit (9) from the dividend, attach it to 11 and continue: 119 / 15

On to step 5:
If we divide 119 by 15, we get 7 and a remainder of 14.
Use 7 as the next digit of our solution. 
Result so far: 2757.0
Subtract 105 from 119 to get 14.
Fetch the next digit (8) from the dividend, attach it to 14 and continue: 148 / 15

Moving on to step 6:
If we divide 148 by 15, we get 9 and a remainder of 13.
Record the quotient 9 as the next digit in the result. 
Result so far: 27579.0
If we subtract 135 from 148, we 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.

Let's proceed to step 7:
The number 15 fits into 130 8 times, leaving a remainder of 10.
Record the quotient 8 as the next digit in the result. 
Result so far: 27579.8
Subtract 120 from 130 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 8:
The number 15 fits into 100 6 times, leaving a remainder of 10.
Record the quotient 6 as the next digit in the result. 
Result so far: 27579.86
If we take 90 away from 100, 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 9:
100 divided by 15 is 6 with a remainder of 10.
The next digit of our result is 6. 
Result so far: 27579.866
If we take 90 away from 100, 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.

After the division, we end up with 27579.866 and a remainder of 0.001.