Mike and his little brother Andy are headed for the Dinosaur Card Trading Fair. They're ready to wheel and deal. It's 4 Stegosaurus for 1 Triceratops and 2 Triceratops for 1 Allosaurus. But can they get what they really want: The tremendous gigantic ferocious Tyrannosaurus rex? The Math concept of equivalency - understanding when values are equal – is introduced in this fast-paced story as two brothers try to beat the clock and make the ultimate trade.
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