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    E:\Working\Orange_Education\TouchPad_Maths_4\Open_Files\Chap_11\Chap_11
                 \ 10-Nov-2025  Bharat Arora   Proof-8                                     Reader’s Sign _______________________ Date __________

                hours into minutes

                Rule: To convert hours into minutes, we multiply the number
                of hours by 60.
                                                                                                       Tips
                example 2. Convert the following into minutes.

                             a.  6 hours                    b.  5 hours 45 minutes            We can write

                Solution.  a.  6 hours  = 6 × 60 minutes                                      •  h for hours
                                          = 360 minutes                                       •  min for minutes
                             b.  5 hours 45 minutes = 5 hours + 45 minutes                    •  s for seconds
                                                         = 5 × 60 minutes + 45 minutes
                                                         = 300 minutes + 45 minutes

                                                         = 345 minutes

                minutes into Seconds

                Rule:  To convert minutes  into  seconds,  we multiply  the
                number of minutes by 60.
                                                                                                       Tips
                example 3. Convert the following into seconds.
                             a.  9 minutes                  b.  3 minutes 30 seconds           ‘Second’ is the smallest

                Solution.  a.  9 minutes  = 9 × 60 seconds                                   unit of time.
                                             = 540 seconds
                             b.  3 minutes 30 seconds = 3 × 60 seconds + 30 seconds

                                                            = 180 seconds + 30 seconds
                                                            = 210 seconds

                            Exercise 11F

                    1.  Convert the following into hours:
                        a.  3 days               b.  5 days               c.  7 days 12 hours      d.  9 days 9 hours

                        e.  8 days 15 hours  f.  6 days                   g.  3 days 6 hours       h.  2 days 18 hours

                    2.  Convert the following into minutes:
                        a.  7 h                  b.  7 h 30 min           c.  4 h                  d.  8 h 15 min

                        e.  9 h 7 min            f.  5 h 24 min           g.  18 h 40 min          h.  13 h 27 min
                    3.  Convert the following into seconds:

                        a.  15 min               b.  20 min               c.  8 min 18 s           d.  9 min 10 s

                        e.  25 min 34 s          f.  18 min 15 s          g.  7 min 40 s           h.  58 min 12 s

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