caroline has a pan of lasagna 3/4 full. Some friends come over and eat 2/3 of what was in the pan. How much lasagna did her friends eat?
The friends at 2/3 of 3/4. "Of" is word problem for "multiply." They ate (2/3)(3/4). To multiply fractions, multiply the top across, and the bottom across: (2/3)(3/4) = 6/12, which reduces to 1/2, since you can evenly divide both 6 and 12 by 6. Your answer is 1/2 - they ate 1/2 a pan of lasagna. 1/4 is the amount remaining in the pan after the friends eat.
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