Young readers will expand their knowledge about all the ways in which to measure things. This age-appropriate volume covers the basic units of measurement in terms of length, weight, and time. It explores the different kinds of measurement systems, which vary depending on what country you live in. Full-color photographs throughout this book provide useful examples of real-world measurements and tools used in measuring. Achievable text allows readers to explore this essential math concept for themselves or with the help of an adult.