To calculate \( \frac{1}{2} \times 40 \times 30 \):
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First, multiply \( 40 \times 30 \): \[ 40 \times 30 = 1200 \]
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Then, multiply the result by \( \frac{1}{2} \): \[ \frac{1}{2} \times 1200 = 600 \]
So, \( \frac{1}{2} \times 40 \times 30 = 600 \).