1. **Problem (b): Write down a fraction equivalent to $\frac{2}{9}$.** To find an equivalent fraction, multiply numerator and denominator by the same number. For example, multiply both by 2: $$\frac{2 \times 2}{9 \times 2} = \frac{4}{18}$$ So, $\frac{4}{18}$ is equivalent to $\frac{2}{9}$. 2. **Problem (c): Simplify $\frac{15}{20}$ to its simplest form.** Find the greatest common divisor (GCD) of 15 and 20, which is 5. Divide numerator and denominator by 5: $$\frac{15 \div 5}{20 \div 5} = \frac{3}{4}$$ So, $\frac{15}{20}$ simplifies to $\frac{3}{4}$. 3. **Problem (d): Calculate $\frac{8}{23} - \frac{3}{23}$.** Since denominators are the same, subtract numerators: $$\frac{8 - 3}{23} = \frac{5}{23}$$ So, the result is $\frac{5}{23}$. 4. **Problem 8 (a): Write down a metric unit for volume of juice in a glass.** A common metric unit for volume is the **milliliter (mL)** or **liter (L)**. 5. **Problem 8 (b): Write down an imperial unit for length of a bus.** A common imperial unit for length is the **foot** or **yard**. **Summary:** - (b) Equivalent fraction to $\frac{2}{9}$ is $\frac{4}{18}$. - (c) Simplified form of $\frac{15}{20}$ is $\frac{3}{4}$. - (d) $\frac{8}{23} - \frac{3}{23} = \frac{5}{23}$. - (8a) Metric unit for volume: milliliter (mL). - (8b) Imperial unit for length: foot.