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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 __________

                  Example 2: Subtract 28 m 62 cm from 75 m 91 cm.

                  Solution:   Arrange the given lengths in the two columns of m and cm, respectively, and
                                 then subtract.

                                 Step 1: Subtract ‘cm’.                                                     m        cm

                                           91 cm – 62 cm = 29 cm                                           6 15     8 11
                                                                                                           7 5      9 1
                                           Write 29 in the cm column.
                                                                                                        – 2 8       6 2
                                 Step 2: Subtract ‘m’. 75 m – 28 m = 47 m                                  4 7      2 9

                                           Write 47 in the m column.

                                 Thus, 75 m 91 cm – 28 m 62 cm = 47 m 29 cm.

                  Example 3: Subtract 18 km 525 m from 25 km 118 m.

                  Solution:    Arrange the given lengths in the two columns of km and m, respectively, and
                                 then subtract them.

                                 Step 1:  Subtract ‘m’. Since 118 < 525, we cannot subtract 525 m from 118 m.

                                          So, we regroup km and m.

                                           25 km 118 m = 24 km 1118 m                                   km         m

                                           Now, 1118 m – 525 m = 593 m                                    14   10
                                                                                                       1  4     0 11
                                           Write 593 under the m column.                               2 5      1 1 8

                                 Step 2: Subtract ‘km’. 24 km – 18 km = 6 km                       – 1 8        5 2 5
                                                                                                          6     5 9 3
                                           Write 6 under the km column.

                                 Thus, 25 km 118 m – 18 km 525 m = 6 km 593 m

                  Example 4: Subtract 4 km 780 m from 15 km 222 m.

                  Solution:  We first convert kilometre into metres.

                                 15 km 222 m = 15222 m
                                                                                                            11
                                 4 km 780 m = 4780 m                                                    4   1 12

                                 Now, we subtract 4780 m from 15222 m                                1 5 2 2 2 m
                                                                                                 –      4 7 8 0 m
                                 15222 m – 4780 m = 10442 m                                          1 0 4 4 2 m

                                                       = 10 km 442 m

                  Mathematics-3                                                                                         163

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