5. Alberto spends \( \$ 18.39 \) on new ear buds. How much change should he receive if he gives the cashier \( \$ 20.00 \) ?

To find out how much change Alberto should receive, simply subtract the cost of the ear buds from the amount he gives to the cashier. So, \( \$ 20.00 - \$ 18.39 = \$ 1.61 \). Therefore, Alberto should receive \( \$ 1.61 \) in change. Now, a fun fact: Did you know that the first pair of earbuds were introduced in 1980 and were part of Sony's Walkman? They have since evolved into a billion-dollar industry with variations like wireless, noise-cancelling, and more! If you're ever uncertain about making change, a handy tip is to always break it down into smaller amounts. If you had \( \$ 20.00 \), you could visually think of it as \( \$ 1.00 \) bills or quarters to make counting easier. Common pitfalls include forgetting to carry over when dealing with cents!