"The mathematical concepts of elapsed time, converting units of time, and equivalent units of time are introduced as readers learn about astronauts aboard the International Space Station. Concepts include adding and subtracting units of time, using a number line diagram, and time intervals. This book features a discover activity, connections to science and history, and mathematical vocabulary introduction"-- Provided by publisher.

IMath ideas : cities in space -- Discover activity : time that tune -- Go team! -- Great gravity -- Connecting to science -- Life on the ISS -- Math at work -- Connection to history -- iMath ideas : on time -- What comes next?.