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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 __________

                                       Learning by Doing

                  Objective: To make a sand clock.

                  Materials required: Two plastic-bottles, sand, aluminium foil, a marker,
                  stands

                  Procedure:

                          Get into pairs.

                          Take a plastic bottle and fill it with dry and fine sand.

                          Cover its mouth with aluminium foil.
                          Make a very small hole in the foil.

                          Now, place the bottle filled with sand on the other bottle in the

                          inverted position, as shown in the figure.

                          Note and mark the sand levels at suitable interval, say 5 minutes.
                          Record the time when the inverted bottle becomes empty.

                          Mental Maths

                     Fill in the blanks and answer the following questions.

                      Your name: _______________                      Your friend’s name: ______________

                      Your birth date:                                Your friend’s birth date:

                      Your present age:                               Your friend’s present age:
                       _____ years _____ months                        _____ years ____ months

                         •  Who is older: You or your friend? _____________

                         •  In which year will you be 20 years old? ___________
                         •  In which year did you get admission in the school? __________
                         •  In which class were you in July 2021? ___________

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