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O'Clock
O'clock refers to exact hour times (like 3:00 or 7:00) when the minute hand points to 12 and the hour hand points directly at a number.
O'clock times are the first type of time children learn to read on an analog clock. At any o'clock time, the minute hand points straight up at 12, and the hour hand points directly at the hour number. The word 'o'clock' is a contraction of 'of the clock.' Teaching o'clock times first builds a foundation for understanding more precise times. I Can Tell Time begins with o'clock lessons in its earliest levels.