To express \(1\frac{3}{8}\) as a rational number, you can convert the mixed number into an improper fraction.
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Convert the whole number (1) to a fraction: \[ 1 = \frac{8}{8} \]
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Add the fractional part (\(\frac{3}{8}\)): \[ 1\frac{3}{8} = \frac{8}{8} + \frac{3}{8} = \frac{8 + 3}{8} = \frac{11}{8} \]
So, \(1\frac{3}{8}\) as a rational number is \(\frac{11}{8}\).