Description Top-Level Math Operations 960 approaches number and arithmetic learning—the starting point of math and an essential tool across all areas of mathematics—with a new philosophy and methodology. Through task-based arithmetic problems combined with a variety of situations, processes, and approaches, this series not only builds strong computational skills but also cultivates advanced mathematical thinking. Top-Level Math Operations 960 will be a great support for children who get bored or tired of simple repetitive arithmetic drills, children who need creative-thinking arithmetic practice beyond the basics, children working on advanced application of school curriculum, children who need to think through math rather than mechanically solve problems, children who want to build a solid foundation rather than rush into excessive advanced learning, children preparing early and steadily for gifted education programs, math olympiads, or specialized schools, and indeed any child who loves math and wants to excel at it. Table of Contents 161–200 Addition and Subtraction Without Carrying/Borrowing Issue 1: Addition Issue 2: Subtraction Issue 3: Addition Facts Issue 4: Subtraction Facts Answer Key