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First, rewrite 19/21 and 8/9 so that they have a common denominator.
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First, rewrite 19/21 and 8/9 so that they have a common denominator.

User John Simit
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we can simply do that by multiplying each by the other's denominator.


\cfrac{19}{21}\hspace{9em}\cfrac{8}{9} \\\\[-0.35em] ~\dotfill\\\\ \cfrac{19}{21}\cdot \cfrac{9}{9}\implies \boxed{\cfrac{171}{189}}\hspace{9em}\cfrac{8}{9}\cdot \cfrac{21}{21}\implies \boxed{\cfrac{168}{189}}

User DepecheSoul
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