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                 \ 10-Nov-2025  Bharat Arora   Proof-8                                     Reader’s Sign _______________________ Date __________

                    2.  Write the following times using a.m. or p.m.

                        a.  6 o’clock in the morning  ________         b.  11:15 at night                     ________
                        c.  7:10 in the evening        ________        d.  1:30 in afternoon                  ________

                        e.  2:50 late at night            ________      f.  11:55 at night                    ________

                        g.  5:45 in the evening        ________        h.  6:32 in the morning                ________

                    3.  Write the time 1 hour before:

                        a.  7:40 a.m.  ________  b.  1:00 p.m.  ________  c.  12:30 a.m.                    ________
                        d.  12:15 p.m.  ________  e.  5:05 p.m.  ________  f.  2:00 a.m.                    ________

                    4.  What is the time after 1 hour?

                        a.  2:05 p.m.  ________  b.  4:15 a.m.            ________  c.  6:00 p.m.           ________

                        d.  11:00 p.m.  ________  e.  8:30 a.m.  ________  f.  5:40 p.m.                    ________

                  5.  Write the missing time in each sequence.

                        a.  8:40 a.m., 10:40 a.m., _____, _____             b.  6:10 p.m., 10:10 p.m., _____, _____

                24-houR CloCk

                Kittu  is going  to her  Nani’s house by train.

                Looking at the ticket, she was a little surprised.
                Do you know why she was surprised?
                She was surprised  to  see  the  time  on it.  It
                was written as 16:00. She asked her mother,

                ‘When is it  16 o’clock?  There are only 12
                numbers on a clock, so how can it be 16?’
                Mother: (smiling)  The clock  with  12 numbers  is  a 12-hour clock.

                Similarly, there is a 24-hour clock which shows the 24 hours of a
                day. The time shown on this ticket is based on the 24-hour clock.
                After 12 noon, 1:00 p.m. is counted as 13, 2:00 p.m. as 14 and so on.

                Kittu: Oh, so 16:00 is 4:00 p.m.

                Mother: Yes, you are right.                                                            Analog clock
                Kittu: So, 8:00 p.m. is 20:00 p.m., 11:00 p.m. is 23:00 p.m. and
                12:00 midnight is 24:00 p.m.                                                         20 : 1 1

                Mother:  Hold on! 24-hour times are neither  a.m. nor p.m. They
                are expressed by saying ‘hours’. Midnight is represented as 24:00                      Digital clock
                hours (the end of the day) as well as 00:00 hours (the start of the next day).

                       184       Mathematics 4

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