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K-3MathStart series.
Illustrated by
Valeria Petrone.
When his ducks double in number, a young cowboy needs twice as much hay to make the birds' nests, twice as many sacks to carry their food, and so on. While the story is bland, it's a serviceable introduction to the concept of doubling. Bright, exaggerated illustrations feature a freckle-faced cowpoke in an oversize Stetson and chubby ducks with extra-long bills. Related math activities are appended.