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    E:\Working\Focus_Learning\Math_Genius_2_(09-10-2023)\Open_Files\Chap_02
                   \ 26-Feb-2024  Bharat Arora   Proof-6                                    Reader’s Sign _______________________ Date __________

                  3.  First add the same numbers. then, add the remaining number to the sum.
                        (a)      t    O          (b)      t    O         (c)       t    O         (d)       t    O

                                      4                        5                        8                        6
                                      3                        5                        3                        3
                             +        4               +        7               +        3               +        6

                  CheCkING ADDITION

                  Till now we have learnt addition of numbers. Now, we will learn the method of
                  checking answers. It will help us know if the answer is correct. We use order property
                  for this checking.

                  example 1: Add 16, 37 and 8 and check                  example 2: Find the sum of 14, 18 and
                                  the answer.                                           43.
                  Solution:                                              Solution:

                          t    O                       t    O                    t    O                       t   O
                          2                            2                         1                            1
                          1    6                            8                    1    4                       4    3

                          3    7      Checking         3    7                    1    8      Checking         1    8
                      +        8        Same       +   1    6                +   4    3        Same       +   1    4
                          6    1                       6    1                    7    5                       7    5

                  The answer is correct.                                 The answer is correct.

                           Practice Time 2G

                  Find the sum. Then, check your answer using order property.
                  1.      t    O        t   O         2.       t   O        t    O        3.       t    O        t   O

                               6                               1    7                              1    2
                          1    2                                    3                              3    9
                      +        8    +                      +   1    4   +                      +   4    1    +

                  4.      t    O        t   O         5.       t   O        t    O        6.       t    O        t   O

                          2    6                               1    7                              2    7
                          1    8                               2    6                              3    6

                      +   2    8    +                      +   4    3   +                      +   2    8    +

                  46                                                                                     Mathematics-2

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