ABSTRACT
Addition and subtraction with whole numbers is the computation focus for grades K-2. In grades 3-5, students expand their thinking to the development of accurate algorithms that can be applied efficiently, regardless of the particular whole numbers involved. In fifth grade, students extend such thinking to the addition and subtraction of decimals. Games and puzzles serve as excellent vehicles for maintaining and expanding these concepts and skills. Developing students’ understanding of addition and subtraction, rather than having them merely apply rote procedures, is a complex goal. In real life, information may be stated implicitly, rather than explicitly, requiring the ability to use deductive reasoning. Logical Numbers puzzles require solvers to interpret and combine clues to identify the solution.
