Basic HTML Version

|  | Table of Contents |  | View Full Version

Page 156 - Math_Genius_V1.0_C2_Flipbook
P. 156

    E:\Working\Focus_Learning\Math_Genius_2_(09-10-2023)\Open_Files\Chap_09
                   \ 26-Feb-2024  Bharat Arora   Proof-5                                    Reader’s Sign _______________________ Date __________

                  Standard Units of Length

                  To make our judgement more reliable and accurate, we should have a common set

                  of standard units of measurement. Scientists all over the world accepted a set of
                  standard units for the sake of uniformity.

                  The fixed measurements for measuring lengths are centimetres and metres.
                  Centimetre

                                  This is a centimetre. We write centimetre as cm.

                    cm        cm

                                                                                                      Note
                                                                                            We use the word ‘about’ to
                                                                                            show that the measurement
                  About 1 cm      About 3 cm                    About 15 cm                 is not exact.

                  We use a 15 cm or 30 cm ruler to measure shorter lengths.

                  Measuring Length Using a Ruler (Scale)

                  To measure the length of an object with a ruler, we follow these steps:

                  Step 1.  Place the ruler adjacent to the object along its length.

                  Step 2.  Adjust the object so that its one end could be alongwith the zero mark of
                             the ruler.

                  Step 3.  Look at the other end
                             of the object and read

                             carefully the mark aligned
                             with this end of the object. It gives us the length of the object. Here, it is

                             10 cm. Thus, the length of the above pencil is 10 cm.

                           Quick Check
                         What is the length of the spoon?

                                                                                                        ______ cm

                 154                                                                                     Mathematics-2

| 151 152 153 154 155 156 157 158 159 160 161 |