**Question 1:**
Find expansion $0.\stackrel{\xb7}{5}$
correct to $4$
significant figures

**Question 2:**
Convert to decimal: $\frac{1}{2}$

**Question 3:**
Convert to fractional form: $0.45$

**Question 4:**
Reduce $\frac{12}{15}$
to the lowest form term

**Question 5:**
Which set of numbers consists of rational numbers?

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