<_title>Learning Clock <_description>Learn how to tell the time <_prerequisite>The concept of time. Reading the time. <_goal>Distinguish between time-units (hour, minute and second). Set and display time on a clock. <_manual>Set the clock to the time given, in the time-units shown (hours:minutes or hours:minutes:seconds). Click on the different arrows, and move the mouse, to make the numbers go up or down.