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When used with the Talking Hot Dots® Pen, these flashcards become a fun, hands-on way to build vocabulary across the core subjects of math, science, social studies, and language arts. Each vocabulary set includes 50 vocabulary cards introducing a total of 400 vocabulary words. The cards measure 8"�x5"�, are double-sided, and feature questions with illustrations. Without the Pen (sold as a separate item), these sets can still be used as typical flashcards since an answer key card is included. However, by using the Pen with the vocabulary cards, the student receives immediate, self-checking feedback. ~ Anh