We look at the division of 426029 by 15 
The aim is to understand the frequency of 15 in 426029.

On to step 1:
4 divided by 15 is 0 with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Take the next digit (2) from the dividend and append it to 4, then repeat: 42 / 15

Going ahead to step 2:
15 goes into 42 2 times with a remainder of 12.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtract 30 from 42 to get 12.
Append the next digit (6) from the dividend to 12 and continue with: 126 / 15

Let's proceed to step 3:
The number 15 fits into 126 8 times, leaving a remainder of 6.
The next digit of our result is 8. 
Result so far: 28.0
Deduct 120 from 126 and we're left with 6.
Grab the next digit (0) from the dividend, add it to 6, then carry on: 60 / 15

Advancing to step 4:
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: 284.0
Deduct 60 from 60 and we're left with 0.
Include the next digit (2) from the dividend after 0, then repeat: 2 / 15

Advancing to step 5:
The number 15 fits into 2 0 times, leaving a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 2840.0
The remainder is 2 after subtracting 0 from 2.
Include the next digit (9) from the dividend after 2, then repeat: 29 / 15

Going ahead to step 6:
The number 15 fits into 29 1 times, leaving a remainder of 14.
Put 1 as the next digit of the answer. 
Result so far: 28401.0
Subtracting 15 from 29 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 7:
If we divide 140 by 15, we get 9 and a remainder of 5.
The next digit of our result is 9. 
Result so far: 28401.9
If we subtract 135 from 140, 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.

Going ahead to step 8:
50 divided by 15 is 3 with a remainder of 5.
The number 3 becomes the next digit in our result. 
Result so far: 28401.93
Deduct 45 from 50 and we're left 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.

Let's proceed to step 9:
If we divide 50 by 15, we get 3 and a remainder of 5.
The next digit of our result is 3. 
Result so far: 28401.933
Subtract 45 from 50 to 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.

The final result is 28401.933 with a remainder of 0.0005.