Let's investigate

Introduces quadrilaterals, which are closed shapes made up of four straight lines, through a combination of theory and problems.

Introduces a variety of activies to help understand maps, plans, and scale drawings.

Contains questions, games, and activities to help young mathematicians learn to understand and draw graphs.

Contains questions, games, and activities to help young readers learn how to crack and create codes.

Explores the world of shapes and how they can be drawn, measured, and used in various activities.

Text and activities explain how time, distance, and speed can be measured.

Contains questions, games, and activities for young mathematicians to help them improve their estimating skills.

Discusses many tools used to help people with math, including the abacus and slide rule, and focuses on the calculator showing how to use the basic keys.

Introduces the concepts of ratio and proportion through problems and exercises on finding fair shares and comparing sizes and amounts of similar objects, quantities, and groups.

Presents the lives and characteristics of such sea creatures as whales, sharks, seals, and corals.