Final answer:
Sidh needs 3/8 pound of watermelon for half of the recipe.
Step-by-step explanation:
To find out how much watermelon Sidh needs, you need to multiply the amount of watermelon in the original recipe by half. First, convert 3/4 pound to a common denominator of 2 to get 6/8 pound of watermelon. Next, multiply 6/8 by 1/2 to find 3/8 pounds of watermelon needed for half of the recipe.