B. 5/7 -2/3 c. 5/7 ×4/5 d. 1/2:1/8

B. 5/7 -2/3 c. 5/7 ×4/5 d. 1/2:1/8

$frac{5}{7} - frac{2}{3} = frac{15}{21} - frac{14}{21} = frac{1}{21}$

$frac{5}{7} times frac{4}{5} = frac{4}{7}$

$frac{1}{2} div frac{1}{8} = frac{1}{2} times frac{8}{1} = frac{8}{2} = 4$

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