Question

What is the difference :8/7-1/3 -31/21 --7/4 -17/21 -4/7

Answer 1

8/7-1/3

Make both fractions have the same common denominator

24/21 - 7/21

Subtract the numerators while keeping the denominator the same

Final Answer: C. 17/21

Answer 2

$\frac{8}{7} - \frac{1}{3} = \frac{17}{21}$

because in order to solve you need to get the common denominator, which in this case is 21...

$\frac{3}{3} ( \frac{8}{7} ) = \frac{24}{21}$

$\frac{7}{7} ( \frac{1}{3} ) = \frac{7}{21}$

and now that you have a common denominator you can complete the operation...

$\frac{24}{21} - \frac{7}{21} = \frac{17}{21}$