1. **State the problem:** Kelly gave 1/5 of her picture cards to Holly, which equals 10 cards. We need to find how many picture cards Kelly has left. 2. **Set up the equation:** Let the total number of picture cards Kelly originally had be $x$. Since she gave 1/5 of them to Holly, we have: $$\frac{1}{5}x = 10$$ 3. **Solve for $x$:** Multiply both sides by 5 to isolate $x$: $$x = 10 \times 5 = 50$$ Kelly originally had 50 picture cards. 4. **Find how many cards Kelly has left:** She gave away 10 cards, so the remaining cards are: $$50 - 10 = 40$$ **Final answer:** Kelly has 40 picture cards left.