$=\frac{2}{7}\times \frac{4}{3}$
Multiply fractions $\frac{a}{b}\times\frac{c}{d}=\frac{a \times c}{b \times d}$$=\frac{2\times 4}{7\times 3}$
Multiply the numbers: $ 2\times 4=8$$=\frac{8}{7\times 3}$
Multiply the numbers: $ 7\times 3=21$$=\frac{8}{21}$