Uses number sense to involve students in calendar activities based on the Julian and Gregorian calendars. (YDS)

Helps students make sense of the three ratios--the ratio between corresponding lengths, the ratio between corresponding areas, and the ratio between corresponding volumes--and begin to construct proportional relationships among them. (ASK)

Discusses how students construct their own understanding of mathematics as they discover and then learn it in class. Presents Krystal's method to subtract mixed numbers that her peers adopt and name for her. (ASK)

Presents different real-world mathematics activities on data display and data analysis with pie charts from different time periods. (ASK)

This book is designed to help teachers in the elementary grades deepen their understanding of the mathematics they have to teach. It is based on the belief that teachers cannot teach what they do not understand well, and it addresses several fundamental questions: (1) What math concepts and skills are important in the elementary grades?; (2) Why…

Presents activity pages containing world population data for students to use to predict future population figures and Consumer Price Index (CPI) data to track changes in the costs of the goods. Includes answer key. (KHR)

Describes how Thales, one of the Seven Sages of ancient times, used shadows and similar triangles to measure the heights of the pyramids. Includes activities on surveying. (YDS)

Beginning with more than 60 mathematics problems commonly taught in middle and high school, this book shares the excitement and mystery of mathematics, shows students how 60 mathematicians discovered mathematical solutions, and demonstrates how these discoveries can be applied to everyday situations. Each chapter presents the historical background…

Discusses ways of counting the population, then and now, thanks to Herman Hollerith, who developed the Hollerith tabulating system using punch cards, punch machines, and tabulating machines. (ASK)