Question

在数轴上， $\dfrac15$ 和 $\dfrac13$ 正中间的分数是多少？

What fraction lies halfway between $\dfrac15$ and $\dfrac13$ on the number line?

$\dfrac{1}{4}$

$\dfrac{2}{15}$

$\dfrac{4}{15}$

$\dfrac{53}{200}$

$\dfrac{8}{15}$

$\dfrac15$ 和 $\dfrac13$ 的中点是它们的平均数。

$\dfrac{\frac15 + \frac13}{2} = \dfrac{\frac{8}{15}}{2} = \dfrac{4}{15}.$

所以正确答案是 C。

The midpoint of $\dfrac15$ and $\dfrac13$ is their average.

$\dfrac{\frac15 + \frac13}{2} = \dfrac{\frac{8}{15}}{2} = \dfrac{4}{15}.$

Thus, the correct answer is C .