In this book, readers learn what the clock measures and why knowing how to tell time--in seconds, minutes, and hours--is important. They learn the history of the clocks, including sundials and hourglasses. They also learn how to read analog and digital clocks to tell time. Sidebars instruct math by showing readers how to add and subtract hours. How tall are you? How many days are there until your birthday? Should you dress to stay warm or to keep cool today? Students can easily find these answers and many more by measuring. Knowing how to find length, time, and temperature helps kids every day. This series shows youngsters how measuring can help them make sense of their world. Additional features to aid comprehension include a table of contents, a phonetic glossary, informative captions, sources for further research, an index, and an introduction to the author and illustrator

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