When life gives them a problem to solve, Peg and Cat make lemonade -- and get a lesson in bartering -- in a refreshing math adventure. It's a hot day, so what could be cooler than setting up a lemonade stand? When Peg needs some marbles to keep her special marble company, she and Cat decide to sell lemonade in exchange for ten marbles a cup. But the Teens have other ideas. "But just one cup for ten marbles?" says Mora. "I'm not made of marbles " So Peg and Cat keep changing their sign until they hit a price -- two marbles -- that has customers lining up. There's just one problem: Peg and Cat forgot the cups Can they barter their way back into business -- or will they end up totally freaking out?
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