Question 92 (d)

Write the following as rational numbers in their standard form.
$240 \div (- 840)$

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Solution

Here, $240 \div (- 840) = \frac{240}{- 840}$
$∵$ HCF of 240 and 840 = 120.
On dividing numerator and denominator by their HCF, we get
$\frac{240 \div 120}{- 840 \div 120} = \frac{2}{- 7}$
$= \frac{2 \times (- 1)}{- 7 \times (- 1)}$
$= \frac{- 2}{7}$

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