d. \( 1 \frac{1}{8}-\frac{3}{5}= \)

To solve \( 1 \frac{1}{8}-\frac{3}{5} \), first convert the mixed number to an improper fraction. \( 1 \frac{1}{8} = \frac{9}{8} \). Now you have \( \frac{9}{8} - \frac{3}{5} \). To subtract, find a common denominator, which is 40: Convert \( \frac{9}{8} \) to \( \frac{45}{40} \) and \( \frac{3}{5} \) to \( \frac{24}{40} \). So, \( \frac{45}{40} - \frac{24}{40} = \frac{21}{40} \). Thus, \( 1 \frac{1}{8}-\frac{3}{5} = \frac{21}{40} \). Now you can proudly share that you've tackled a tricky math problem! To further engage with math, why not try creating similar problems? Like mixing different fractions or even introducing some negative ones for added challenge. Math is all about practice and exploration!