Year 9 students can make it easier to change decimals into fractions and fractions into decimals by using these helpful strategies:

1. Understanding Place Value: Learn that each number in a decimal has its own value. For example, $0.75$ means $75$ hundredths. This can also be written as the fraction $\frac{75}{100}$.

2. Using Equivalent Fractions: When you see a decimal like $0.5$, think of it as $\frac{5}{10}$. You can make it simpler by changing it to $\frac{1}{2}$.

3. Memorizing Common Conversions: It helps to remember some easy conversions. For instance, $0.25$ is equal to $\frac{1}{4}$ and $0.333...$ is the same as $\frac{1}{3}$. Knowing these can save you time.

4. Practice with Examples: Let’s convert $0.8$ to a fraction:

   • Start by writing it as $\frac{8}{10}$.
   • Then, simplify it to $\frac{4}{5}$.

With these simple tips, changing between decimals and fractions can be a lot easier!