Question 69 (i)

Reduce the following rational number in its lowest form:
$\frac{- 60}{72}$

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Solution

$\frac{- 60}{72}$ can be written as
$= \frac{- 60 \div 12}{72 \div 12}$ [dividing numerator and denominator by HCF of -60 and 72 = 12]
$= \frac{- 60 \times \frac{1}{12}}{72 \times \frac{1}{12}}$ [ $∵$ Reciprocal of 12 = $\frac{1}{12}$ ]
$= \frac{- 5}{6}$ , which is the lowest form.

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