Lindsey Helps at the Library: Subtract Within 20

Algebra is a foundational concept in the study of mathematics, and readers will delight in learning the principles of operations and algebraic thinking in a relatable and engaging way. Topics such as adding and subtracting within 20, using algebraic principles to solve equations and word problems, and understanding the relationship between addition and subtraction will give beginning math students a firm grasp on basic math concepts. Lindsey loves to read, and she also knows how to subtract within 20. The library is the perfect place for her to relate counting to subtraction while also helping her local librarian. This volume satisfies CCSS Math Standard 1.OA.C.5. This book should be paired with Let's Help the Librarian! (9781477721216) from the InfoMax Math Readers Program to provide the alternative point of view on the same topic.