\(\dfrac{7}{16}\times\dfrac{2}{21}=\dfrac{14}{365}=\dfrac{1}{24}\)
\(\dfrac{11}{10}-\dfrac{2}{5}:\dfrac{2}{3}=\dfrac{11}{10}-\dfrac{2}{5}\times\dfrac{3}{2}=\dfrac{11}{10}-\dfrac{3}{5}=\dfrac{11}{10}-\dfrac{6}{10}=\dfrac{5}{10}=\dfrac{1}{2}\)
7/16 x 2/21
= 1/24
11/10 - 2/5 : 2/3
= 11/10 - 3/5
= 1/2