Key Idea1 of 3
O'Clock Means On the Hour
When the minute hand points straight up to the 12, it is exactly on the hour. We say 'o'clock'. If the hour hand points to 3 and the minute hand is on 12, it is 3 o'clock.
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Math — Telling Time to the Hour
When the minute hand points straight up to the 12, it is exactly on the hour. We say 'o'clock'. If the hour hand points to 3 and the minute hand is on 12, it is 3 o'clock.