Match the equivalent fractions from each row:

(i) $\dfrac{250}{400}$

(ii) $\dfrac{180}{200}$

(iii) $\dfrac{660}{990}$

(iv) $\dfrac{180}{360}$

(v) $\dfrac{220}{550}$

(a) $\dfrac{2}{3}$

(b) $\dfrac{2}{5}$

(c) $\dfrac{1}{2}$

(d) $\dfrac{5}{8}$

(e) $\dfrac{9}{10}$

Reduce each fraction to its simplest form:

(i) $\dfrac{250}{400} = \dfrac{250 \div 50}{400 \div 50} = \dfrac{5}{8}$. Matches with (d).

(ii) $\dfrac{180}{200} = \dfrac{180 \div 20}{200 \div 20} = \dfrac{9}{10}$. Matches with (e).

(iii) $\dfrac{660}{990} = \dfrac{660 \div 330}{990 \div 330} = \dfrac{2}{3}$. Matches with (a).

(iv) $\dfrac{180}{360} = \dfrac{180 \div 180}{360 \div 180} = \dfrac{1}{2}$. Matches with (c).

(v) $\dfrac{220}{550} = \dfrac{220 \div 110}{550 \div 110} = \dfrac{2}{5}$. Matches with (b).

Hence, the matches are:

(i) ↔ (d), (ii) ↔ (e), (iii) ↔ (a), (iv) ↔ (c), (v) ↔ (b).