My Book of Easy Telling Time: Learning about Hours and Half-Hours [Paperback] [Apr 01, 2006] Kumon

Using Kumon's step-by-step approach, this workbook introduces children to the concept of telling time by concentrating on the hours first, and then incrementally introducing children to half- and quarter-hours. Learning to tell time this way will also help children improve their general understanding of numbers. Ages 4-6.