10. \( \frac{9}{8}-\frac{2}{8} \)

To solve \( \frac{9}{8}-\frac{2}{8} \), simply subtract the numerators since the denominators are the same: \( 9 - 2 = 7 \). Thus, you have \( \frac{7}{8} \). You can also think of this in a fun way: imagine you have 9 slices of delicious pie and you give away 2; you're left with 7 delightful slices to enjoy! Now, if you ever find yourself in a situation where you have different denominators, a common mistake is forgetting to find a common denominator before subtracting. Always remember to do that first, and you’ll be on your way to pie—or math—perfection!