(i) 1 by \(\frac{1}{2}\)

= \(\frac{1}{\frac{1}{2}}\)

= \(1\times \frac{1}{2}\)

= 2

(ii) 5 by \(\frac{-5}{7}\)

= \(5 \div \frac{-5}{7}\)

= \(\frac{5}{-5}\times 7\)

= -7

(iii) \(\frac{-3}{4}\) by \(\frac{9}{-16}\)

= \(\frac{3}{4} \div \frac{9}{16}\)

= \(\frac{3}{4}\times \frac{16}{9}\)

= \(\frac{4}{3}\)

(iv) \(\frac{-7}{8}\) by \(\frac{21}{-16}\)

= \(\frac{-7}{8} \div \frac{21}{16}\)

= \(\frac{-7}{8}\times \frac{16}{21}\)

= \(\frac{2}{3}\)

(v) \(\frac{7}{-4}\) by \(\frac{63}{864}\)

= \(\frac{7}{-4} \div \frac{63}{64}\)

= \(\frac{-7}{4}\times \frac{64}{63}\)

= \(\frac{-16}{9}\)

(vi) 0 by \(\frac{-7}{5}\)

= \(0 \div \frac{-7}{5}\)

= \(0\times \frac{-5}{7}\)

= 0

(vii) \(\frac{-3}{4}\) by -6

= \(\frac{3}{4} \div -6\)

= \(\frac{-3}{4}\times \frac{-1}{6}\)

= \(\frac{1}{8}\)

(viii) \(\frac{2}{3}\) by \(\frac{-7}{12}\)

= \(\frac{2}{3} \div \frac{-7}{12}\)

= \(\frac{2}{3}\times \frac{12}{-7}\)

= \(\frac{-24}{21}\)

= \(\frac{-8}{7}\)

(ix) -4 by \(\frac{-3}{5}\)

= \(-4 \div \frac{-3}{5}\)

= \(-4\times \frac{-5}{3}\)

= \(\frac{20}{3}\)

(x) \(\frac{-3}{13}\) by \(\frac{-4}{65}\)

= \(\frac{-3}{13} \div \frac{-4}{65}\)

= \(\frac{-3}{13}\times \frac{65}{-4}\)

= \(\frac{15}{4}\)