In Math Challenge I-B, students expand middle school math skills to a deeper level with topics in beginning algebra, fundamental geometry, counting strategies, and basic number theory. The students not only learn practical skills of challenging problem solving that are supplemental to their school curricula, but also develop skills in creative thinking, logical reasoning, oral and written presentation, and team work. This course helps 6th to 8th graders to participate in the American Mathematics Competition (AMC) 8, MathCounts, Math Olympiads for Elementary and Middle School (MOEMS), and Zoom International Math League (ZIML) Division M.

The course is divided into four terms:

- Summer, covering Pre-Algebra and Word Problems
- Fall, covering Geometry
- Winter, covering Counting & Probability
- Spring, covering Number Theory

The book contains course materials for Math Challenge I-B: Number Theory.

We recommend that students take all four terms. Each of the individual terms is self-contained and does not depend on other terms, so they do not need to be taken in order, and students can take single terms if they want to focus on specific topics.