231458 ÷ 15 
The aim is to understand the frequency of 15 in 231458.

Moving on to step 1:
15 can be fit into 2 0 times, resulting in a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Grab the next digit (3) from the dividend, add it to 2, then carry on: 23 / 15

Step 2:
The number 15 fits into 23 1 times, leaving a remainder of 8.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 15 from 23 and we're left with 8.
Include the next digit (1) from the dividend after 8, then repeat: 81 / 15

Let's proceed to step 3:
15 can be fit into 81 5 times, resulting in a remainder of 6.
The next digit of our result is 5. 
Result so far: 15.0
If we subtract 75 from 81, we get 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 15

On to step 4:
When dividing 64 by 15, we get 4 with a remainder of 4.
Write down 4 as next digit of the result. 
Result so far: 154.0
The remainder is 4 after subtracting 60 from 64.
Fetch the next digit (5) from the dividend, attach it to 4 and continue: 45 / 15

Let's proceed to step 5:
The number 15 fits into 45 3 times, leaving a remainder of 0.
Use 3 as the next digit of our solution. 
Result so far: 1543.0
Subtracting 45 from 45 leaves us with 0.
Grab the next digit (8) from the dividend, add it to 0, then carry on: 8 / 15

Going ahead to step 6:
When dividing 8 by 15, we get 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 15430.0
If we subtract 0 from 8, 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.

On to step 7:
The number 15 fits into 80 5 times, leaving a remainder of 5.
The next digit of our result is 5. 
Result so far: 15430.5
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.

On to step 8:
50 divided by 15 is 3 with a remainder of 5.
Put 3 as the next digit of the answer. 
Result so far: 15430.53
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.

Moving on to step 9:
The number 15 fits into 50 3 times, leaving a remainder of 5.
Put 3 as the next digit of the answer. 
Result so far: 15430.533
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 15430.533 and a remainder of 0.0005.