To evaluate the expression:

\[
= \frac{1}{2} \times 5 \times 20
\]

First, calculate \(\frac{1}{2} \times 5\):

\[
\frac{1}{2} \times 5 = 2.5
\]

Next, multiply \(2.5\) by \(20\):

\[
2.5 \times 20 = 50
\]

So, the value of the expression is:

\[
\boxed{50}
\]

Would you like more details or have any questions about this calculation?

Here are 5 related questions to explore further:
1. How do you calculate the area of a triangle using the formula \(\frac{1}{2} \times \text{base} \times \text{height}\)?
2. What are the properties of multiplication involving fractions and whole numbers?
3. How do you solve expressions involving multiple operations?
4. How would you handle this calculation using decimals instead of fractions?
5. Can the distributive property be used to simplify expressions like \(\frac{1}{2} \times (5 \times 20)\)?

**Tip:** Always remember the order of operations (PEMDAS: Parentheses, Exponents, Multiplication and Division, Addition and Subtraction) when evaluating expressions!

Learn how to evaluate the expression 1/2(5)(20) with a step-by-step calculation. This problem involves arithmetic operations and multiplication. Suitable for students in Grades 4-6.

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