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Animals make perfect counting company! The simple language teaches young readers mathematical terms and counting concepts. Learn to count by 2s up to twenty with the Penguin Pairs book in this adorable series that counts the critters. Special thanks to content consultants Paula J. Maida, Ph.D. and Terry Sinko. Looking Glass Library is an imprint of Magic Wagon, a division of ABDO Publishing Group. Grades preK-3.