Question

Express 2/7 as a rational number with denominator-21

Answer 1

$\longrightarrow\underline{\underline{\red{\sf{solution}}}}$

$\sf \: the \: rational \: number \: given = \frac{2}{7}$

$∴7 \times( - 3) =( - 21)$

so,

$\sf\frac{2}{7} \times \frac{ - 3}{ - 3} = \frac{ - 6}{ - 21}$

$∴ \sf\frac{2}{7} as \: a \: rational \: number \: with \\ \sf \: denominator \: ( - 21) \: is \: \frac{ - 6}{ - 21}$

hence ,

$\sf \frac{ - 6}{ - 21} \: is \: rational \: number \: is \: as \: a \: \\ \sf rational \: number \: with \: denominator \: -21$