To convert the mixed number \(1 \frac{3}{8}\) into a decimal percentage, follow these steps:
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Convert the mixed number to an improper fraction: \[ 1 \frac{3}{8} = \frac{8}{8} + \frac{3}{8} = \frac{11}{8} \]
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Convert the improper fraction to a decimal: \[ \frac{11}{8} = 1.375 \]
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Convert the decimal to a percentage by multiplying by 100: \[ 1.375 \times 100 = 137.5% \]
Thus, \(1 \frac{3}{8}\) as a decimal percentage is 137.5%.