Celebrate diversity, math, and the power of storytelling! A math picture book series for preschoolers and kindergarteners with relatable stories that reflect little kids' everyday experience. César wants to borrow his little sister Gabi's brand-new cerulean crayon. She doesn't know what color that is, though, and she won't let him show her! Instead, she asks him yes-no questions to rule out crayons. It's like a game of 20 Questions-fun for Gabi and...

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