Young math books

By making believe there are no straight edges or rulers in the world, the reader learns the geometric principles of straight, parallel, and perpendicular lines.

Discusses a solution to an arithmetic problem based on the rhyme about Solomon Grundy's life.

Defines rays and segments, explains how they can be put together to form polygons, and describes how to make a clockboard and use it to create various geometric designs.

Explains the process of division by comparing division to a guessing game.

Introduces the principles of right angles through paper folding techniques which allow the reader to construct a rectangle and a square.

Introduces the principles of geometry through the use of shadows.

Explains in simple terms the principles of a base five number system.

Simple experiments with easily available materials explain the theory of probability and how it is used by scientists, poll-takers, and industrialists.

Explains in simple terms how areas are measured.

Simple games using dots and lines introduce concepts of logic and mathematics.