"Did you know cheetahs can run 70 miles per hour? How do we know this? In this book, readers learn how to measure speeds like that of a cheetah using a simple formula and metric and imperial units. Diagrams, illustrations, and photographs further illuminate the knowledge presented and help readers fully grasp the concept. A concluding activity teaches readers to measure their own speed and puts their knowledge to the test" --

"Time is measured in a variety of units, including seconds, hours, days, weeks, and decades. This practice began with the sundials of ancient Egypt, but we still use clocks and calendars today to keep track of our time. This volume guides readers through measuring time, figuring out time zones, and learning about classic and modern timepieces. Through a fun activity and introductions to some famous scientists, readers will gain a better understanding...

To build a house or paint a room, a person must know how to calculate the area of the space. Readers will learn ways to calculate area using height and length through this book's understandable diagrams, illustrations, and photographs. Examples from real-world experiences will bring the exercises to life, and readers can apply their knowledge to solving the math problems featured throughout.

"Even if objects are about the same size, that doesn't mean they're the same weight. Readers will learn about many units that measure weight and about concepts such as density, gravity, and mass. With colorful photographs and engaging illustrations of ancient and modern scales, this book will help readers learn facts about weight, including how boats float and how weight is a factor in baking" --