ratio and proportion

Tells the story of phi, the never ending, never repeating number known as the Golden Ratio, written as 1.6180339887..., looking at how it has been used, and claims about its use, throughout the history of mathematics.

Explores the relationship between aesthetics and mathematics, discussing topics such as Pythagoras' theorem about patterns and numbers in nature, and looking at the mathematical aspects of music, art, poetry, and other disciplines.

Two squabbling siblings learn about symmetry when their babysitter helps them build and fly a kite.

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.

Explores the concepts of ratio and proportion by growing or shrinking various objects by the same amounts.

Introduces the concept of ratio by comparing what humans would be able to do if they had bodies like different animals.