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\frac{6\times 7}{16}\times \frac{8}{21}
Express 6\times \frac{7}{16} as a single fraction.
\frac{42}{16}\times \frac{8}{21}
Multiply 6 and 7 to get 42.
\frac{21}{8}\times \frac{8}{21}
Reduce the fraction \frac{42}{16} to lowest terms by extracting and canceling out 2.
1
Cancel out \frac{21}{8} and its reciprocal \frac{8}{21}.
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