Express the following rational number in its standard form:
$\frac{- 15}{35}$

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Solution

Given rational number is $\frac{- 15}{35}$
For standard form of given rational number $= \frac{- 15 \div 5}{35 \div 5}$ [ $∵$ HCF of 15 and 35 = 5]
$= \frac{- 3}{7}$
Hence, the standard form of $\frac{- 15}{35}$ is $\frac{- 3}{7} .$

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