Calculate Total Pizzas: Four Children Each Eating Half a Pizza

To solve this problem, let's proceed step by step:

• Step 1: Identify the given information:
  We know that there are 4 children and each child eats $\frac{1}{2}$ pizza.
• Step 2: Apply the formula:
  We use the formula: Total pizza consumed = Number of children × Amount of pizza per child. Here, this is $4 \times \frac{1}{2}$.
• Step 3: Perform the calculation:
  Calculate $4 \times \frac{1}{2} = \frac{4}{2} = 2$.

Conclusion:
The total number of pizzas consumed by the children is $2$.