a)
[tex]3 \times \frac{2}{7} = \frac{3}{1} \times \frac{2}{7} = \frac{3 \times 2}{1 \times 7} = \frac{6}{7} [/tex]
b)
[tex]4 \times \frac{7}{31} = \frac{28}{31} [/tex]
c)
[tex]5 \times \frac{11}{78} = \frac{55}{78} [/tex]
d)
[tex]7 \times \frac{13}{99} = \frac{91}{99} [/tex]
e)
[tex] \frac{2}{3} \times \frac{4}{7} = \frac{8}{21} [/tex]
f)
[tex] \frac{5}{11} \times \frac{4}{3} = \frac{20}{33} [/tex]
g)
[tex] \frac{7}{10} \times \frac{3}{8} = \frac{21}{80} [/tex]
h)
[tex] \frac{4}{17} \times \frac{11}{5} = \frac{44}{85} [/tex]
