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We can measure time on either an analogue or digital clock. An analogue clock is marked in 12 hour intervals and the clock hands need to pass the12 for the second time to indicate a 24 hour period.
To indicate the period between 12 o’clock midnightand12 o’clock midday, we use the a.m. abbreviation i.e.5:00 am. To indicate the period between 12 o’clock noon and 12 o’ clock midnight, we use the p.m.
abbreviation i.e. 5:00 p.m. A digital clock works on a 24 hour basis. We do not use a.m or p.m to indicate the Time of day, because 5:00 a.m is 05h00 And5:00 p.m is 17h00 1
The three figures will help us to read a watch or a clock.
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Hour hand indicates hours and Minute-hand indicates minutes.
In figure (i) hour-hand is indicating number 1 or just after 1. So, we read it as 1 hour. The minute hand indicates 4 divisions after the number 3, i.e., 3 x 5 + 4 = 19, or 19 divisions from 12. So we read it as 19 minutes.The watch indicates that the time is 1 hour 19 minutes.
We may express it as 1: 19. We may say it is 19 minutes past 1.At or after the number that the hour-hand indicates, the number expresses the hour.
At or after the number that the minute-hand indicates, the number multiplied by 5 and number of divisions after the number, express the minutes. If minute hand indicates 3 divisions after number 7, then minutes is 7 x 5 + 3 = 38 minutes.In figure (ii) hour hand is between 3 and 4. So, we say it is 3 hours. The minute hand is 2 divisions after number 8. So, minute is 8 x 5 + 2 = 42 minutes.
The time is 3 hours 42 minutes. We may write it as 3 : 42. We may say it is 42 minutes past 3,
or, (60 – 42 = 18 minutes) 18 minutes to 4.In figure (iii) expresses 8: 35 or 35 minutes past 8 or, (60 – 35 = 25 minutes
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