To express \( 2.5 \) as a fraction in its lowest form, follow these steps:
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Write \( 2.5 \) as a fraction: \[ 2.5 = \frac{25}{10} \quad \text{(since 2.5 is the same as } \frac{25}{10} \text{)} \]
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Simplify the fraction \( \frac{25}{10} \):
- Find the greatest common divisor (GCD) of 25 and 10, which is 5.
- Divide both the numerator and the denominator by their GCD: \[ \frac{25 \div 5}{10 \div 5} = \frac{5}{2} \]
Thus, \( 2.5 \) expressed as a fraction in its lowest form is \( \frac{5}{2} \).