Subtracting fractions that have different bottom numbers (denominators) can be tough for Year 8 students. It involves understanding some math concepts and following several steps, which can be confusing. Here’s an easier way to look at the steps you need to take:

1. Identify the Denominators:
   First, look at the bottom numbers of the fractions you want to subtract. This should be easy, but students sometimes forget this step. If you want to subtract $\frac{1}{4}$ from $\frac{2}{3}$, you need to see that the denominators are $4$ and $3$. Missing this can make the next steps harder.

2. Find a Common Denominator:
   Next, find a common denominator. This can be tricky. You need to figure out the least common multiple (LCM) of the denominators. For $4$ and $3$, the LCM is $12$. Finding the LCM can cause mistakes if you don’t multiply correctly or miss some multiples.

3. Convert Each Fraction:
   After you have a common denominator, change each fraction so they both have this new bottom number. This involves multiplying. For $\frac{1}{4}$, you multiply the top and the bottom by $3$, giving you $\frac{3}{12}$. For $\frac{2}{3}$, you multiply by $4$ to get $\frac{8}{12}$. Even though this seems easy, students sometimes forget to change both the top and bottom correctly.

4. Subtract the Numerators:
   Now, you can subtract the top numbers (numerators). This step needs careful attention, or you might make mistakes. In our example, you take $8 - 3$, which equals $5$. So, you end up with $\frac{5}{12}$. When it comes to simplifying or seeing similar fractions, students can often get confused, which makes things harder.

5. Final Result:
   Lastly, write the result in its simplest form. This can be confusing too if students aren’t sure how to simplify fractions.

In short, subtracting fractions with different denominators can be a tricky process that might overwhelm students. But if you take it step by step and practice, it can get easier. It’s important to take your time with each step, as rushing can lead to mistakes.