Question

which one is greater
a.3/7 or 9/21

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Answer 1

Step-by-step explanation:

To find the greater one between $\dfrac{3}{7}$ and $\dfrac{9}{21}$, we must have equal denominator.

Lcm of 7 and 21 is 21

$\quad \dfrac{3}{7}=\dfrac{3\times 3}{7\times 3}=\dfrac{9}{21}$

$\quad \dfrac{9}{21}=\dfrac{9\times 1}{21\times 1}=\dfrac{9}{21}$

Clearly, the fractions are equal.

Therefore, $\dfrac{3}{7}=\dfrac{9}{21}$