Question

To get the product 1, we should multiply ${\displaystyle \frac{8}{21}}$ by ______.

पर्याय

• ${\displaystyle \frac{8}{21}}$

• ${\displaystyle \frac{-8}{21}}$

• ${\displaystyle \frac{21}{8}}$

• ${\displaystyle \frac{-21}{8}}$

Answer 1

To get the product 1, we should multiply ${\displaystyle \frac{8}{21}}$ by ${\displaystyle \underline{\frac{21}{8}}}$.

Explanation:

Let the number be x.

${\displaystyle x\times \frac{8}{21}=1}$

Divide each side with ${\displaystyle \frac{8}{21}}$,

${\displaystyle x=\frac{1}{\frac{8}{21}}=\frac{21}{8}}$

Thus, we should multiply ${\displaystyle \frac{8}{21}}$ by ${\displaystyle \frac{21}{8}}$ to get 1.