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    E:\Working\Orange_Education\Math_Genius_2\Open_Files\Chap_09
                   \ 26-Sep-2025  Bharat Arora   Proof-10                                   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

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

                  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 such that one end is along with 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.

                          Fast Check

                         What is the length of the spoon?

                                                                                                        ______ cm

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