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 beautiful summer day sets the stage for readers to work with addition and subtraction equations in this title, which prompts readers to determine the missing number in an equation of three factors. This volume satisfies CCSS Math Standard 1.OA.D.8. This book should be paired with "Fun in Fall" (9781477720349) from the Rosen Math Readers Program to provide the alternative point of view on the same topic.