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Master all kinds of measuring as you lift over 150 flaps in this informative book. There are speeds to calculate, thermometers to read, and lengths to measure with a handy pop-out ruler! All the major units and instruments used for measuring length, temperature, time, weight, and volume are covered. Hands-on interactive flaps show familiar real-world examples that make it easier for children to understand why and how we measure things. Also covers the differences in US customary and the metric system units of measurement.Series: Advanced Lift-the-Flap Board BooksIdeal for improving general knowledge and guaranteed to keep fact-loving, question-asking children entertained for hours.