Let's divide 146369 by 15
The aim is to understand the frequency of 15 in 146369.

Step 1:
If we divide 1 by 15, we get 0 and a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Bring next digit (4) of the dividend behind the 1 and repeat the process: 14 / 15

On to step 2:
When dividing 14 by 15, we get 0 with a remainder of 14.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 14 leaves us with 14.
Bring next digit (6) of the dividend behind the 14 and repeat the process: 146 / 15

Let's proceed to step 3:
146 divided by 15 is 9 with a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 9.0
If we take 135 away from 146, we end up with 11.
Grab the next digit (3) from the dividend, add it to 11, then carry on: 113 / 15

Moving on to step 4:
113 divided by 15 is 7 with a remainder of 8.
Put 7 as the next digit of the answer. 
Result so far: 97.0
Subtract 105 from 113 to get 8.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 15

On to step 5:
The number 15 fits into 86 5 times, leaving a remainder of 11.
The number 5 becomes the next digit in our result. 
Result so far: 975.0
If we subtract 75 from 86, we get 11.
Take the next digit (9) from the dividend and append it to 11, then repeat: 119 / 15

Moving on to step 6:
If we divide 119 by 15, we get 7 and a remainder of 14.
Put 7 as the next digit of the answer. 
Result so far: 9757.0
Deduct 105 from 119 and we're left 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.

Moving on to step 7:
If we divide 140 by 15, we get 9 and a remainder of 5.
Record the quotient 9 as the next digit in the result. 
Result so far: 9757.9
Subtracting 135 from 140 leaves us 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 8:
15 can be fit into 50 3 times, resulting in a remainder of 5.
Write down 3 as next digit of the result. 
Result so far: 9757.93
Subtracting 45 from 50 leaves us 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.

Moving on to step 9:
15 can be fit into 50 3 times, resulting in a remainder of 5.
The number 3 becomes the next digit in our result. 
Result so far: 9757.933
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.

The final outcome is 9757.933, with a leftover of 0.0005.