20. \( (7+3) \frac{1}{2}= \)

To solve \( (7+3) \frac{1}{2} \), start by simplifying the expression in the parentheses. You have \( 7 + 3 = 10 \). Then, you multiply that result by \( \frac{1}{2} \). So, \( 10 \times \frac{1}{2} = 5 \). Therefore, \( (7+3) \frac{1}{2} = 5 \). Now let's think about how this kind of calculation is used in real life! When you share a pizza with friends, if you order a pizza that has 10 slices and want to find out how many slices would be left if you eat half, you’d use the same mathematical principles—it's all about breaking things down into simpler parts. Additionally, one common mistake is forgetting to simplify the parentheses first! It’s like trying to build a Lego set without sorting the pieces. Always address those calculations inside the parentheses first for clarity and accuracy—that’s your foundation for success!