This module focuses on solving problems involving addition and subtraction of one- and two-digit numbers. Emphasis is also placed on investigating multiplication and division. Also included: materials lists; activity descriptions; questioning techniques; problem-solving examples; activity centre and extension ideas; assessment suggestions; and activity sheets and visuals. All modules include a list of children's books and websites related to the mathematics topics introduced, a detailed introduction to the Hands-On Mathematics program (guiding principles, implementation guidelines, an overview of the skills that students use and develop during mathematics inquiry), and a classroom assessment plan and record-keeping templates.