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. A lively basketball game provides the framework for teaching readers the meaning of the equal sign. Readers will be prompted to determine if addition and subtraction equations are true or false. This volume satisfies CCSS Math Standard 1.OA.D.7.