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Four Stegosaurus for 1 Triceratops. Two Triceratops for 1 Allosaurus. It's the Dinosaur Card Trading Fair, and brothers Mike and Andy are wheeling and dealing, trying to make enough trades to get the ultimate card -- the ferocious Tyrannosaurus rex. True dinosaur facts on the cards are an added bonus in this story about equivalency, an elementary algebraic concept.O'Malley, Kevin is the author of 'Dinosaur Deals: Equivalent Values (Mathstart)' with ISBN 9780606222891 and ISBN 0606222898.
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