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    E:\Working\Brother_Education\Preparatory_Stage_Maths-3_(11-09-2024)\Open_Files\CHAP_10
                 \ 06-Jan-2024               Sonia Suyal   Proof-1                            Reader’s Sign _______________________ Date __________

                  24-Hour CloCk

                  We know that a day has 24 hours. The hour                                     2400 hours
                                                                                                   or
                                                                                                0000 hours
                                                                                         2300 hours
                  hand takes 2 rounds of the clock to cover 24                       2200 hours  11  12  1  0100 hours
                                                                                                           0200 hours
                  hours. We use a.m. (ante meridiem) for the time                 2100 hours  9  10 midnight  2  3  0300 hours
                  from 12 midnight to 12 noon and p.m. (post                    2000 hours  8                 4  0400 hours
                  meridiem) is used for the time from 12 noon                 1900 hours  7                    5  0500 hours
                  to 12 midnight.                                             1800 hours  6  p.m.        a.m.   6  0600 hours
                                                                              1700 hours  5                    7  0700 hours
                  We commonly use 12-hour clock to see the                              4                     8
                                                                                1600 hours                      0800 hours
                  time. But railways, airlines and armed forces use               1500 hours  3  2  noon  10  9  0900 hours

                  24-hour clock to read and tell time.                               1400 hours  1  12  11  1000 hours
                                                                                         1300 hours  1200 hours 1100 hours
                  Look at the clocks shown below.

                                                       11  12  1                                           Note
                                                     10        2    analog                         The 24-hour clock
                    20:00                           9 8        4 3   clock                         does not use a.m. or

                                                                                                   p.m. to show the time.

                         digital clock                 7  6  5
                  Both clocks show the same time, that is, 8 o’clock at night. The digital clock shows the
                  time in 24-hour clock in  the form hh:mm. The first two digits in 24-hour clock show hours

                  and the last two digits show minutes.
                  In 24-hour clock, 12 midnight is denoted as 00:00 hours or as 24:00 hours.

                                                       time (in hours and minutes)
                         24-hour                     12-hour                    24-hour                  12-hour

                    0000/00:00 hours               12 midnight             1200/12:00 hours              12 noon
                    0100/01:00 hours                1:00 a.m.              1300/13:00 hours             1:00 p.m.

                    0200/02:00 hours                2:00 a.m.              1400/14:00 hours             2:00 p.m.
                    0300/03:00 hours                3:00 a.m.              1500/15:00 hours             3:00 p.m.
                    0400/04:00 hours                4:00 a.m.              1600/16:00 hours             4:00 p.m.
                    0500/05:00 hours                5:00 a.m.              1700/17:00 hours             5:00 p.m.

                    0600/06:00 hours                6:00 a.m.              1800/18:00 hours             6:00 p.m.
                    0700/07:00 hours                7:00 a.m.              1900/19:00 hours             7:00 p.m.

                    0800/08:00 hours                8:00 a.m.              2000/20:00 hours             8:00 p.m.
                    0900/09:00 hours                9:00 a.m.              2100/21:00 hours             9:00 p.m.
                    1000/10:00 hours                10:00 a.m.             2200/22:00 hours            10:00 p.m.

                    1100/11:00 hours               11:00 a.m.             2300/23:00 hours             11:00 p.m.

                 178                                                                                    Mathematics-3

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