Basic HTML Version

|  | Table of Contents |  | View Full Version

Page 153 - Touchpad Mathematics_Ver1.0_C4
P. 153

    E:\Working\Orange_Education\TouchPad_Maths_4\Open_Files\Chap_09\Chap_09
                     \ 10-Nov-2025  Bharat Arora   Proof-8                                    Reader’s Sign _______________________ Date __________

                    MeASurIng LengTh

                    The base unit to measure length is the metre (m). It is also called the standard unit
                    of length.

                     Units of length larger  than the metre  Units of length smaller than the metre
                     are decametre (dam), hectometre (hm)  are decimetre  (dm), centimetre  (cm)
                     and kilometre (km).                                  and millimetre (mm).
                                      1 dam  =  10 m                                          1 m  =  10 dm

                                        1 hm  =  100 m                                      1 dm  =  10 cm
                                        1 km  =  1000 m                                     1 cm  =  10 mm

                    Conversion of Bigger units of Length into Smaller units

                    If we want to convert a bigger unit into a smaller unit, we need to multiply the bigger
                    unit.
                    The following examples will help you understand the conversion of units of length.

                    example 1. Convert the following into centimetres.
                                 a.  6 m                       b.  13 m 4 cm                  c.  3 m 50 cm
                    Solution.  a.  6 m
                                     We know that 1 m = 100 cm.
                                     So, 6 m = 6 × 100 cm = 600 cm.
                                 b.  13 m 4 cm = 13 m + 4 cm  = (13 × 100) cm + 4 cm = 1300 cm + 4 cm = 1304 cm

                                 c.  3 m 50 cm = 3 m + 50 cm = (3 × 100) cm + 50 cm

                                                                    = 300 cm + 50 cm = 350 cm

                    example 2. Convert the following into metres.
                                 a.  71 km                     b.  96 km 230 m
                    Solution.  a.  We know that 1 km = 1000 m.
                                     So, 71 km = 71 × 1000 m = 71000 m.

                                 b.  96 km 230 m = 96 km + 230 m = (96 × 1000) m + 230 m
                                                                          = 96000 m + 230 m = 96230 m
                    example 3. Convert:
                                 a.  6 m into dm               b.  10 m into cm               c.  8 cm into mm
                    Solution.  a.  1 m = 10 dm
                                     So, 6 m = (6 × 10) dm = 60 dm.

                                 b.  1 m = 100 cm
                                     So, 10 m = (10 × 100) cm = 1000 cm.
                                 c.  1 cm = 10 mm
                                     So, 8 cm = (8 × 10) mm = 80 mm.

                                                                                                                  151
                                                                                                 Measurement

| 148 149 150 151 152 153 154 155 156 157 158 |