a) $\frac{3}{2} = \frac{{3 \times 5}}{{2 \times 5}} = \frac{{15}}{{10}}$ ; $\frac{2}{5} = \frac{{2 \times 2}}{{5 \times 2}} = \frac{4}{{10}}$
b) $\frac{{17}}{{20}} = \frac{{17 \times 5}}{{20 \times 5}} = \frac{{85}}{{100}}$ ; $\frac{{63}}{{50}} = \frac{{63 \times 2}}{{50 \times 2}} = \frac{{126}}{{100}}$
c) $\frac{{33}}{{500}} = \frac{{33 \times 2}}{{500 \times 2}} = \frac{{66}}{{1000}}$ ; $\frac{{147}}{{250}} = \frac{{147 \times 4}}{{250 \times 4}} = \frac{{588}}{{1000}}$
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