Answer
$5\dfrac{25}{27}$
Work Step by Step
Convert each mixed number to an improper fraction to obtain:
$=\dfrac{21}{8} \times \dfrac{9(1)+7}{9}
\\=\dfrac{10}{3}\times \dfrac{16}{9}$
Multiply the numerators together and the denominators together to obtain:
$\require{cancel}
\\=\dfrac{10(16)}{3(9)}
\\=\dfrac{160}{27}
\\=5\dfrac{25}{27}$