Represent 0.45 as a rational number.

$\frac{9}{2}$

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$\frac{9}{20}$

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$\frac{4}{5}$

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$\frac{5}{4}$

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Solution

The correct option is B
$\frac{9}{20}$

To convert 0.45 into a fraction:
$0.45 = \frac{45}{100}$
[Multiplying 0.45 with $\frac{100}{100}$ ]

Dividing the numerator and the denominator by 5, we get
$\frac{45}{100} = \frac{9}{20}$

$∴ 0.45 = \frac{9}{20}$

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