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(3)
K-3
Illustrated by
Doug Cushman.
During recess, monkey schoolkids Jack and Jill model the mathematical concept of doubling in various ways: with parts of their bodies ("2 knees + 2 knees = 4 knees"), with their friends ("3 kids + 3 kids = 6 kids"), etc. Franco's rhyming text presents the concept cleanly and engagingly. Cushman's assorted animals are child stand-ins, wearing human clothes and solving human arithmetic.