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    E:\Working\Focus_Learning\Math_Genius_3_(11-09-2024)\Open_Files\CHAP_09
                 \ 12-Sep-2024                      Surender Prajapati   Proof-5              Reader’s Sign _______________________ Date __________

                  Measuring length

                  units of Measuring length

                  Centimetre , metre and kilometre are some standard units of length.

                          Centimetre                            Metre                               Kilometre

                      • It is the smaller unit     • It is another unit of length used to     • It is the bigger unit of length
                      of length used to           measure longer lengths.                   used to measure the bigger
                      measure shorter              • It is denoted by ‘m’.                  lengths.
                      lengths.                 Examples: Length of a cloth, height of  • It is denoted by ‘km’.

                      • It is denoted by ‘cm’.  a wall, height of a tree.                Example: Distance between
                   Examples: Length of a                                                 two cities.
                   pencil, length of a crayon,
                   length of a book.

                                                                                            141 km

                    6 cm    12 cm     25 cm      2 m       6 m             15 m

                  Measuring short length

                  We use a scale to measure the length of an object. The scale has                   Remember
                  two types of marks — long marks and short marks. The long marks                      1 cm  = 10 mm
                  on the scale are 1 cm apart. Each centimetre is divided into 10

                  small equal parts called millimetres (mm).

                  If we want to measure the length of an object like a pencil using a scale, we place the
                  object alongside the ruler with one end of the object at the zero mark of the ruler as
                  shown below.

                                                                                             Knowledge Desk
                                                                                            In Ancient time, the popular
                                                                                            measure of length was "Gaz"
                                                                                            2 Hath = 1 Gaz.
                  We take the reading at the other end of the object. This gives us the length of the object.

                  The length of the above pencil is 4 cm.

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